AG's have a proper military structure, weapon mastery AND swarm behavior themself. It is AG Doctrine to swarm Knights with grunt units until they succumb to the sheer wave behavior. Sion specificly had to cut herself free from complete surrounding multiple times. And when I speak about complete surrounding I mean COMPLETE surrounding.
The issue with those feats is that both Heartless and AG's are complete fodder in skill compared each respective character. Whiping the same fodder over and over again does not show impressive skill.
And while Roxas was getting weaker, Sion was getting closer and closer to death, with a body more badly decayed than a decade old corpse.
So tldr, Its not a good argument in the first place and even if it were, Sion has it beat by a mile.
While it is true that each respective hoard are rather fodder compared to the fighter's, it looks like you're somewhat downplaying Roxas's state of being. Yes, his body wasn't failing on him, but throughout day's we've seen that this weakening has both A, made it harder for him to use the Keyblade's power, and B, has caused him to see Visions/Nightmare's. In addition, the further day's went on, the worse Roxas's mental state became, as he slowly uncovered all the lies he had been told for his entire year of being part of Organization 13. To say that Roxas was mentally being shredded would be a understatement, but even with that he still held the skill to fight off so many enemies with little to no power or hax. Sion may have been at Death's Door, which is commendable, but Roxas's body was slowly becoming fodder in comparison to the physical stats of those he fought, and his mental state was rapidly spiraling into a emotional mess.
This isn't even to mention how, at the beginning of Day's, Roxas was also fighting in spite of being a literal mental baby (He couldn't even formulate more than 2 words, let alone sentences.)
So we agree that Sion has this beat as well? Because not only is Sion faster, hers is far more in depth and complex
If this was about speed, Roxas would have her beat by a lightyear- Literally. The speed that character's can perform stunts is less important here than the complexity, keep in mind, as Roxas can literally react to exiting out of a beam of Light, immediately going on the offensive the very moment he exits. That said, I concede that I cannot quite argue againt the complexity of this feat in particular. KH character's rarely do anything as flashy as tossing their sword into the air and catching it at the right moment to block something.
Calling this a pure skill feat is disingenous not gonna lie. Sora has far more hax to compensate for the fight. Sions fight with Hyperion was a PURE skill feat as Sion had NOTHING other than her sword and techniques to fight Hyperion.
It is not a pure skill feat, this is true. Sora had many more hax. But likewise, Xemnas had infinitely more power Hax then Hyperion. It may not be a full skill feat, but clearly Sora would have needed a large degree of Skill to keep up with Xemnas. This also isn't even considering the fact that in most of the Cutscene's I showed, Sora doesn't even use any abilities or hax. It is not 100% skill, but don't write it off as not showing any skill because of that. Sora was fighting someone who had the equivalent to Thousands upon Thousands of soul's, who could have pulled power from all of them. The stakes were blatantly staked against Sora's favor.
This is all scaling chains with not much substance again. The best feat Im seeing is beating Sora after a year of training, weaving through Danmaku, mastering a hard and complicated weapon and a weird fate/precog feat. Sion became the most skilled character within Knight Run as a child and in 2 years. A verse comprised of other insane Sword Masters, like Anne whose control over her body allows her to manipulate her own nerves, or Garou who can counter a omnidirecional shockwave plus space debris being flung at him with Sword Skills only. Sion using Pray Style techniques is far more impressive because the entire style is infamous for wrecking your body with each usage.
The weird no time training feat is not impressive as well. It dosnt matter how long you trained if you cant proof that they grew in skill through that time. What matters is what was archived in that time.
The whole Precog feat is questionable as well. If the books prophecys are absolute you would be in nonsense territory of "Outskilling fate itself". If they arent then that simply means that they outgrew themselve from the point of the prophecy onwards. Which can range from bridging a small difference to a huge one. Assuming even that Skill was the deciding factor in the first place.
Like look, I'm not trying to rag on Kingdom Heart skill. This not me saying Roxas isnt skilled. But if you want Sions spot you would have to have her beat in more categories. Not only is Sion beating Roxas in most of your arguments, Sion has a entire slew of feats Roxas just plainly dosnt have. Far better senses feats, fat better martial arts feats, better analytical prediction feats FAR better power mimicry feats, better combat feats etc.
All I'm seeing is just a bunch of names being thrown with one or two feats. Inversely, I gave several feats for why Master Xehanort has a insane amount of skill, and a chain to show how Roxas scales to that pretty comfortably. Garou is a little impressive, but Sora's defending against the Laser's is infinitely more so, especially seeing as he also is only using his sword skills to ward them off.
The character in question, Kairi, started off as little more than a damsel in distress. She blatantly had no skill. After the training, she is comfortably fighting alongside Axel, who was trusted by Xemnas as someone who could eliminate Traitors, in spite of said traitor's more than likely having a significant Hax and AP advantage (Marluxia), as well as the fact they were likely to team up on him (Marluxia and Larxene). She was also going toe to toe with Xion, who should have absorbed several of Sora's techniques, as well as having blatantly copied Saix's power near perfectly without difficulty. This same Kairi also pushed Xemnas on his back foot for a time. Tl:dr, she went from absolute Fodder to a recognizably skilled and competent warrior.
As I've said, it is, admittedly, a little dubious. That being said, it was shown that the world functioned on a linear, unchangable timeline, which Sora broke the rules of by using a power known by most master's in a way none ever expected. Regardless, Xehanort even without the book is a masterful analyzer, able to properly gague how everyone in the verse may react, and using them each to his advantage, yet he still lost to Terra's skill anyways.
I don't want to seem like I'm bashing on Sion myself, but I admantly believe that Roxas show's substantially better Skill via scaling. For senses, Roxas can sense a map in his mind of the area and can pinpoint the enemies location without looking at them (Via the Mini-Map, which is confirmed as not just a gameplay feature.) through all kinds of terrain and even buildings, and in general KH character's are able to sense things on a spiritual level, being able to detect hearts, and even being able to tell there is Darkness in the area with just smell. Roxas's Martial Arts, while we don't see him perform anything directly, he scales against the most talented swordsmen of his verse, and he can assess his enemies remaining Health, aka he can analyze and correctly predict how much more damage he has to deal and how much stamina is left in the enemies tank until he defeats them. I'll give the Power Mimicry feats, though Roxas's own ability to quickly pick up on Sora's techniques and even invent his own is nothing to scoff at.
And another check to Xehanort's skill, hundred's of years before the current KH time, Keyblade Master's of vast power were honing ancient Keyblade Techniques and perfecting powerful, unheard of magics. Their lesson's and techniques were passed down through the hundreds of years, until they reached Xehanort. In comparison to these ancient techniques, Sora's own fully self taught techniques were shown as being blatantly superior to Xehanort's, and, as we know, Roxas defeated Sora in Key to Key combat. These ancient wielder's were the pinnacle of Keyblade warriors in their time, the Foreteller's themselves being inferior to Xehanort in spite of being considered the cream of the crop, accepted as the most powerful of their time with only two exceptions (One of which was their master, who would ALSO be inferior to Xehanort's skill via statements). Back during this time, we see several hundreds of Keyblade wielder's from across the Multiverse as we knew it, each of them being chosen by a Keyblade, which only chooses the most worthy.
So basically,
Only the Most Worthy and Talented had Keyblades
The most talented of the most talented were all masters
All of which were inferior to Xehanort, who received the techniques from those times after they were refined for hundreds of years
Xehanort then proceeds to be lower on the skill scale than The Lingering Will, who got defeated by Sora, who should be physically on par or even weaker then him. Roxas then, while being likely comparable in stats and probably with less hax than Sora, defeated Sora and Disarmed him, in spite of Sora scaling far higher than the Cream of The Crop of the verse.
Keep in mind even the weakest of Keyblade Wielder's were expected by Society to slay Multiple Heartless a day, even the most Clumsy and Weakest of them were held to these standards, being told to slay beings that would prey on anyone else and casually steal their soul if they so much as let one heartless get a good hit in.
