There are 2 situations in DxD that can help us determine what difference in power constitutes a Stomp and/or a One-Shot in DxD
First Situation:
Diodora Snake of Ophis Vs Issei Balance Breaker
[Welsh Dragon Balance Breaker!!!!!!]
Something exploded inside me.
“Diodoraaaaaaaa! You! You are the one person I will never forgive!”
I got engulfed by the red aura, and I was now enveloped by the plate armour which has the power of Sekiryuutei in it. Maybe the Sacred Gear responded to my feelings, I turned into Balance Breaker before the two minutes countdown!
“Buchou, everyone. Please don’t interfere.”
“Ise. We will defeat him together. – That’s what I would like to say, but it looks like we can’t stop you. – You can’t hold back, okay?”
Buchou gave me the best reply. Yes, that’s what I’m planning on doing.
“Ddraig, can you hear me?”
[What is it, Partner.]
“Let me do as I want just for today.”
[……Alright.]
Seeing me, Diodora laughs with joy. His whole body is wrapped in a deep black aura.
“Ahahahaha! Amazing! So this is Sekiryuutei! But I also powered-up! With the snake Ophis gave me that is! I can kill you instan~”
GOOOOOOOOOOOOOOON!
I ignited the fire from the boosters on my back, and closed our distance with an instant dash.
BANG!
I punched sharply into Diodora's stomach before he could finish his sentence.
“………Gaahah!”
Diodora's body bends. His face gets distorted to that of receiving intense pain. It seems like he couldn't react to my speed. I push forward my fist, and tried to destroy his insides.
Gough……
Diodora vomits things inside his stomach along with blood. I ask while pulling back my fist.
“And the instant kill you were talking about?”
Diodora steps back while holding on to his stomach. His expression doesn't have the confidence he had before.
“Ku! With something like this! I’m a High-class devil! The blood relative of the current Maou Beelzebub!”
Diodora puts his hand forward, and makes many bullets of demonic-powers.
“There is no way that a noble high blood like myself will lose to a lowly, filthy, and vulgar reincarnated-devil like you!”
Diodora's infinite number of demonic-powered bullets showers down on me like rain drops. I just walk towards him without dodging it. I deflect the bullets with my hand, and I close my distance with him. Even if the bullets hit my armour, I advance forward without any care.
Thank you, Old-man Tannin. That torture isn't something which only became useful. The enemy is supposed to be stronger than Buchou, but his attacks aren't scary at all.
[That’s right. The training with the Dragon-King trained you quite a lot. In the match against Sitri you couldn't show the result, but with no restrictions you can release your power. The durability of the armour is more stable than that time in the match against Sitri.]
Yeah, Ddraig. I couldn't use my full power in the fight against Saji, but its different now. And with this guy as my opponent, I can hit him with the intent to kill.
[In terms of simple battle power, you are quite the opponent right now.]
When I came right in front of him, Diodora stops attacking and tried to make a distance.
GON!
I ignited the boosters on my back and caught up to Diodora immediately. Then he created many defence barriers.
“It looks thinner than Vali's barriers.”
BREAK!
My fist breaks all of his defence barriers with ease.
HIT!
Then a punch to his face! I finally did it! There isn't a hit which makes me feel better than this! Because of the impact of being hit, Diodora slams on to the ground. His face is bleeding, and he also had tears in his eyes.
“……It hurts. It hurts. It hurts! Why! My demonic-power hit you! I was supposed to have had my power increased drastically with Ophis's power!”
I lift Diodora's body……and hit him with my fist covered in aura! A strike to his stomach!
“Guha! Gaha!”
Then a strike to his face! It’s not over yet! I gathered the aura to my right hand, and I tried to hit him with the enormous amount of aura!
“I won’t be defeated by a damn rotten dragon like you!”
Diodora put his left hand forward, and creates a thick wall of aura.
BANG! BREAK-BREAK!
My fist hit the wall, and my impact was stopped.
This….. What can this possibly do!
“Ahahahahahaha! Did you see! I have higher demonic-power than you! There is no way that a power idiot Sekiryuutei can defeat me!”
I then used the power of Sekiryuutei in front of Diodora who is smiling.
“-How about I show you the power of the power-idiot then?”
[Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost!]
GOOOOOOOOOOOOOOOOOOOOON!
Intense amount of aura burst out of the booster, and the impact of my punch increases.
BANG!
A small crack is made on the wall. And then….
BREAK!
The wall perishes with my fist which increased its impact.
“Sorry. I’m a power idiot, so I can only use my power like this. But if you are my opponent, then this should be enough.”
“Hee.”
Diodora changed his expression right away.
“Don’t make our Asia cry!”
I released my punch at him while shouting!
CRUSH!
I crushed and bend Diodora's left hand which was put forward, and from there I directed my fist towards his face!
HIT!
My fist nailed into his face! With my strike, Diodora flies back and crashes against a pillar. Diodora who fell on the ground gets up and then shouts.
“This must be a lie! There is no way I will be beaten! I won against Agares! I’m also planning to win against Bael! There’s no way I will lose to the untalented heir of the Great-King! Gremory who holds affection can’t even be my opponent! I’m Diodora from the House of Astaroth!”
When Diodora puts his hand upwards, many circular sharp things made from demonic-powers appear around me. The sharp objects all point towards me, and come at me like missiles!
-I won’t be able to dodge all of it!
I lower my head down, or I jump to the side to evade it. But there is a limit to it. I fend the sharp objects with a punch or kick. The tip of it bends, and it wraps around me as if it has its own will!
CRACK!
It goes around me finding the thinnest part of the armour, and it destroys it to pierce my body!
Shit…… It hurts! So he gathered the demonic-power to the tip, and opened a small hole on my armour with it. Since he can’t take me on from the front, he decided to aim for the single point, huh………
But, not yet! I used both my hands to pull out all the sharp object at once! Because I pulled it out by force, my blood spills on the ground. Diodora tries to do the same attack again, so I used my booster to shorten my distance with him and released my kick.
CRUSH…..
A sour sound echoes throughout the shrine. My kick hits Diodora's right thigh and it seems like it crushed his bone.
“Daaaaamn itttt!”
Diodora who put on a painful expression points his hand towards me and started to gather demonic-powers immediately. He’s trying to shoot the demonic-power with his utmost level. I also directed my hand towards him. I gather dragon aura to my hand!
DOOOOOOON!
A red light shoots out from my right hand, and a massive demonic-power is also shot from Diodora's hand.
DOOOOOOON!
Our shot collides and pushes against each other….. But with something like this……. You won’t be able to stop me!
“Goooooooo!”
[Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost!]
The power which has been increased by my Sacred Gear passes on to it, and the power of my Dragon Shot increases!
DON!
My Dragon Shot blows away his shot and it skids through along his side. My dragon’s aura which went past him creates a huge hole in a section of the shrine, it pierces through the wall and goes outside.
Let's break this fight down into parts.
1) Issei enters BxB, Diodora is confident but Issei closes the distance without Diodora being able to react and hits him in the stomach that causes Diodora a lot of pain and makes him vomit blood.
This makes it seem like Issei Blitzes Diodora, and also shows that Issei can seriously hurt Diodora.
2) Diodora has a villain tantrum and responds by attacking with blasts of demonic power, Issei does not even bother to dodge them and simply deflects them although some of them reach him but the effect is not described, only that Issei continued advancing while ignoring those attacks until he approached Diodora
this shows Issei as being so strong that Diodora's attacks cannot hurt him.
3) Diodora, scared, tries to defend himself with magical barriers but Issei easily breaks them with one blow and in the process hits Diodora in the face, drawing blood.
once again Issei is shown as superior to Diodora
4) Issei picks up Diodora, gathers aura in his fist and begins to brutalize Diodora
I think at this point we can consider this a Stomp, unless...
5) While being brutalized Diodora manages to compose himself and creates a magical barrier, Issei hits the barrier but his fist is unable to break it
And here begins the interesting part, before Issei managed to break Diodora's magical barriers very easily with his fists, now his aura-charged cigars (which should be stronger) cannot break Diodora's magical barrier.
6) Issei uses Boost to the maximum, increases the aura of his fist and manages to create a crack in the barrier before breaking it and proceeding to break Diodora's hand and hit him in the face sending him flying
By using Boost, Issei once again surpasses Diodora
7) Diodora gets up, has another villain tantrum and proceeds to create sharp objects of demonic power that he then throws at Issei, Issei realizes he will not be able to dodge them, he defends himself with fists and kicks but some manage to hit the thin parts of his armor, piercing it and drawing blood, after this Issei closes the distance and kicks Diodora in the thigh, breaking the bone.
Another interesting thing, unlike before where he did not even think about dodging Diodora's attacks, this time Issei does want to dodge them, but he is unable to do so because there are many and very fast, the attacks that hit (even if it is in thin parts of his armor) manage to break it and damage him, unlike before where Diodora's attacks had no effect
8) Screaming in pain, Diodora gathers all of his demonic power to the maximum in attack, Issei responds the same, the energy blasts collide and remain even until Issei uses Boost to the maximum and his attack manages to surpass Diodora's
once again something interesting, Issei and Diodora have beam struggle and both are even in the clash until Issei uses Boost
What can we get out of this? While at first Issei BxB seemed to be far superior to Diodora Serpent of Ophis, this all seems to be a result of Diodora being overconfident and not giving it his all, once Diodora begins to get desperate and draws out his true power he proves to be able to stop the Issei's attacks, damaging him and Matching his raw power, in those moments only using Boost Issei demonstrates clear superiority over Diodora
Second Situation:
Issei Balance Breaker Vs Sealed Sairaorg
[Welsh Dragon Balance Breaker!!!!!!!!]
As the gauntlet sounded out, it gave off a flash of red light, covering my body. The red aura took on the form of armour—Boosted Gear Scale Mail!
Pak!
Giant dragon wings spread from behind my back and I readied for attack. With a flowing motion, Sairaorg-san also entered a stance. ...Though I have already seen the match video between Sairaorg-san and the delinquent from the Glasya-Labolas family, Sairaorg-san’s speed was still faster than expected. Even god-speed Kiba would feel threatened by this speed. Probably, it is faster than me. ...I cannot keep letting my opponents make the first move. I must take the initiative with suicidal abandon!
GOooooOOOO!
Firing up my back boosters to the max, I fly straight forward! Preparing a straight right punch, I thrust forward! Next is the fist in one motion—! ...Why isn’t he dodging!? Faced with my formidable straight punch, Sairaorg-san was not making any effort to evade! Bastard! Are you saying there is no need to dodge!? Fine, you can take my punch head on!
Crash!
With a deafening sound, my straight right punch made contact with Sairaorg-san’s face! —! H-he really didn’t dodge! Not only that, it was a clean and perfect hit!
A chill. At the instant of contact, I suddenly felt an indescribable chill, forcing me to rapidly take several steps back. After distancing myself, I put up a stance to attack again. ...Sairaorg-san’s body showed no signs of injury. ...Wait a minute. I put quite a lot of force into that straight punch... Though Boost wasn’t used, to think he is completely unhurt without defending. Sairaorg-san pointed at the part where he got hit and smiled.
“An excellent punch. Straight and to the point, a pure punch full of strong will. A normal Devil would have lost to such a punch. But—”
Sairaog-san vanished before my eyes—
“—I am no ordinary Devil.”
Sairaorg-san’s voice and fist next came from behind my back!
Crash! Kaching!
Sairaorg-san’s fist pounded towards me! —! When did he get behind my back!? Damn it! Though I raised my arms to defend, the heavy force of the punch was shocking! Even though the attack was caught by my crossed arms... but the gauntlet! The gauntlet portion of the armour was destroyed by the punch just now!? My body having completely lost balance, I quickly pulled away by shooting demonic power out through the back boosters.
...So fast! My eyes couldn’t follow him at all! By the way, he vanished! I thought my eyes were used to catching high speed motions from training with Kiba! Did I underestimate him? Perhaps a bit. But still, I knew that wasn’t the only reason. By the way, my arms were numb and had no feeling! For my arms to become like that from the impact of the gauntlets’ destruction just now... No, at least my fingers can still move. I can still fight! My bones are still OK!
Ddraig, please regenerate the gauntlets.
[Ah, understood.]
Red aura surrounded my arms and the gauntlets were formed once again. Sairaorg-san gave an impressed smile.
“Hoho. You didn’t get sent flying. Well, that was just a hello punch.”
...A hello punch!? A hello punch destroyed my armour!? W-what kind of joke is this!? This is the first time anyone broke apart Boosted Gear Scale Mail with just their bare hands!
“I have three weapons; strongly built body, fast legs and martial arts. Here I come!”
Sairaorg-san vanished again! The side!? My opponent has instantly appeared beside me! I shrank back to avoid Sairaorg-san’s attack on my body—
Howling!
It was the sound of the punch breaking through the wind! What amazing force from the punch!
Creak...
With a blunt sound, cracks appeared on my armour near the abdomen! How can this be!? Simply brushing past was enough to crack it open!?
“Damn it!”
I cursed and punched back.
Crash!
But Sairaorg-san took it with his face again without dodging! No damage!
Go!
Feeling a counter-attack coming, I pulled back again that instant using the thrusters to jump back. The vigorous sound of air rushing was heard. Sairaorg-san’s kick missed...but the force of the missed kick caused huge cracks to appear from the center of the training hall that rose along the four walls! If that kick were to hit... I felt shivers along my spine. —With that, I was already panting. Just a few exchanges and it was already clear. —Extremely strong. Unimaginable. How can this Devil be from the same generation as Buchou and Diodora Astaroth!? He is far stronger than Diodora!
[Ah, this really surprises me. This man from the Bael family has trained his power to the max. Using Rating Game types, this is a power type who has kept increasing offensive power again and again. How interesting. A man who pursues pure destructive power. Totally extreme. It makes me very interested.]
Wow, Ddraig showing an interest towards someone apart from Maou and other Dragons. True, this was someone so strong that Diodora is entirely no match for him. Perhaps he is stronger than Rias several fold, no, more than ten fold. The Devil born in the Great King’s family without inheriting the Power of Destruction. With nothing but his body, his only choice was to train his body and successfully became the heir. He was like me, a Devil without inborn talent. —This was not the result of short term half-assed training. And to think this young Devil was from the same generation as Buchou. ...Buchou truly was in a difficult situation to compete with such a person. Sairaorg-san is definitely a massive wall obstructing Buchou’s dreams. Furthermore, he is an even higher and steeper, absolute wall in front of my dreams.
“Amazing.”
I said it naturally. From that brief exchange, I was already full of intense respect and admiration.
“So you can reach this level of strength completely through training?”
Faced with my question, Sairaorg-san replied.
“—I just believe in my own body, that’s all.”
Truly an amazing character. This sentence made me understand that this person must have conquered unimaginable obstacles and hardships. And because of that, I must attempt to give my all and test my own limits. Even if it is me, I cannot admit defeat!
...This was a good chance to try out Beelzebub-sama’s suggestion. After Beelzebub-sama helped me to adjust the pieces within my body, he also made a personal suggestion. About me and the pieces—
“Promotion to Rook!”
I made the declaration, promoting to Rook. Yes, Rook, not Queen. Power flowed into my body. With that, offensive and defensive power rose accordingly!
“The Rook?”
Sairaorg-san showed a surprised expression towards my promotion. He must have expected me to promote to Queen. Sairaorg-san then disappeared once again! —It’s coming! I sent power into the legs and entered a defensive stance as if my feet were rooted to the floor! Gritting my teeth, I wrapped my body in aura!
[Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost! Boost!!]
Using the Dragon’s power, I enhanced my defense! I also didn’t forget to power up my right fist at the same time—
Crash!
Sairaorg-san appeared from the front, and sent a heavy punch into my abdomen. —A powerful impact! The force of the punch penetrates straight into my backbone!
...Cough.
Spreading throughout my entire body was intense pain as well as a feeling like everything was drying out! The impact transmitted straight to my feet, with my legs trembling non-stop... Thanks to having lowered my center of gravity, I withstood it. Though my consciousness was nearly lost at one point, I returned to full awareness! If I hadn’t gritted my teeth and struggled to endure it, my consciousness would definitely have been overburdened and lost! The abdomen armour... Though damaged, it has not been completely shattered. Aiming at the exact instant when Sairaorg-san withdrew his fist, I once again sent a powerful straight punch into Sairaorg-san’s face!
Crash!
Though it felt like punching a thick stone wall, I felt through my hand a tiny feeling of something cracking.
Spurt!
Fresh blood came out of Sairaorg-san, but at the same time—
Let's break this fight down into parts.
1) Issei enters BxB and launches himself at Sairaorg, Sairaorg doesn't even bother to dodge and Issei hits him square in the face, Sairaorg is unharmed
Sairaorg's superiority over Issei is shown here
2) Sairaorg moves behind Issei so fast that Issei can't see it coming and throws a punch at him, Issei defends himself with his arms but the blow breaks the armor on his arms.
Sairaorg Blitz Issei and once again demonstrates his superiority
3) Issei moves away from Sairaorg, but once again Sairaorg cuts the distance so fast that he can't see it coming, he stands next to him and throws a fist at him, Issei manages to dodge and the attack only grazes him but still breaks his armor, Issei responds by hitting Sairaog again and again fails to damage him, Sairaorg responds with a kick, Issei steps back and manages to dodge the attack, he comments that Sairaorg is so strong that Diodora would not be a Rival.
Once again Sairaorg Blitzes Issei, his superiority is such that just touching Issei breaks the armor and Issei's attacks are still ineffective.
4) Issei uses Promotion and promotes Rook, his physical defense and physical power increases, then he uses Boost to the maximum and enhances all his attributes, Sairaorg once again cuts the distance so fast that Issei cannot see him and hits Issei in the stomach, The attack cracks the armor but does not break it, Issei responds by hitting Sairaorg in the face, drawing blood.
As you can see, by increasing his powers to their maximum, especially his strength and defense, Issei manages to more or less match the guy who was overwhelming him before.
with that we get this
Issei BxB = Ophis Serpent Diodora
Issei BxB Maximum Power = Sairaorg Contents
Issei BxB Maximum Power >> Diodora Serpent of Ophis
Sairaorg Content >> Issei BxB
Sairaorg Contents >> Diodora Serpent of Ophis
With the difference in power that exists between Issei BxB Standard Power and Issei BxB Maximum Power we can determine the difference in power in DxD that is needed for a battle to be a Stomp, this case would be a x4, obviously a One-Shot would be the same or greater than a Stomp