Sanji made S-Shark (who apparently has Low 5-B durability) not only go white-eyed from a regular kick
Which by itself definitive proof considering that at the beginning of Wano Luffy
manage to white-eyed a drunked Dragon Kaido with Gear 3rd yet we know that he didn't do any damage to him,
same happen with Zoro against Flame On King who tank one of his strongest attack.
but also made him react with visible shock and fear after Sanji casually face-tanked a point-blank attack similar to S-Hawk's reaction when fighting Zoro.
S-Shark only has Low 5-B Dura via their flames, where in terms of AP he only see him bully weaker Straw Hats like Robin and Nami and for the most part he may downscale from S-Hawk
who can press Blackbeard into using Armament Haki to defend himself and him and him be somewhat of a threat to Zoro and Kaku.
Beside that AP wise they isn't much else that suggest they are Low 5-B. So Sanji tanking his attack doesn't grant him Low 5-B.
Luffy and Lucci struggled to damage S-Bear, who is explicitly stated to be far more durable than the other Seraphim. Sanji's peak having more firepower than a Boundman Luffy who isn't using any advanced Haki or Hybrid Lucci is not outrageous, and should honestly be the expectation given we're in the final saga lol.
Beside the
fact that the statement was referring to both S-Bear and S-Hawk, not just the former and then we have even Zoro stating that their durability remind him of King, so yes their Dura derive from their Lunarian physiology.
And if we assume S-Bear its specifically more durable than the other Seraphim then you are not strengthening Sanji's Low 5-B if anything you weaken it, since then S-Shark.
Sanji's peak having more firepower than a Boundman Luffy who isn't using any advanced Haki or Hybrid Lucci is not outrageous, and should honestly be the expectation given we're in the final saga lol.
Why you would assume that Boundman wasn't using any Advanced Armament despite the fact that he already realize their have Kaido's level of toughness with even Lucci had to
remind him that just brute force isn't going to put them down?
Sanji was in front of Nusjuro, yelling and running straight to him. Sanji then deflected Nusjuro's sword and used it as a stepping stool before kicking him in the jaw.
He was running in front yes
but Nusjuro was right in the middle of his attack to Franky and Bonney with his sword, Sanji wasn't technically blocking an attack meant to him.
Keep in mind that Nusjuro is a Great Swordsman that has a Supreme Grade Blade. The fact that a nameless kick from Sanji without even activating his Exoskeleton or Ifrit Jambe was able to overpower a Haki-coated blade swung with the intent to kill by someone of Nusjuro's caliber is very impressive.
Unless you believe Franky and Bonney are people of Nusjuro's caliber, then no in that specific instances its unlikely that he swung the blade at max power, especially when Bonney only unlocked her Gear 5th later.
Meanwhile in comparation with King of Hell Koro (when Zoro has all his swords and let Enma releasing all Armament and Conqueror Haki at once),
we see Nusjuro actually notice him in time and properly defend him which result with both send each other away, here say that Zoro did in fact match Nusjuro full strength its more believable.
And when it come to injure the Five Elders its also a bit tricky when damaging them its a legit feat or not, as the Five Elders (and the God's Knights) often got injured/damaged by attacks weaker than them as due of their immortality they have less need to properly defend themselves as they can still regenerate.
Kizaru didn't break the nonchalant persona he's been dragging on for 15 years in-story and say that he's in a pickle for being expected to defeat either Luffy or Sanji just for Sanji to not be considered to even possibly be on a similar playing field as him.
If you expecting to me to accept that a Current Base Sanji (even without Ifrit Jambe) its already on a similar playing as Kizaru, the same guy who clashed with Gear 5th Luffy for extended period of times and its clearly above Awakening Lucci, someone who can stalemate Zoro and push him to using his full strength, then i'm sorry to tell you but its a big
NO, not based on his current showing.
It's not even narratively inconsistent for Sanji to be capable of fighting Admirals as in the end of Wano
Capable to fight Admirals in one thing as Top Commanders like Jozu and Vista can do it (and Sanji after defeating Queen its definitely at their level), but fight
on par with them or pressing
into using their full strength its another story which i currently don't believe can be apply to Sanji.
And like even with Ifrit Jambe he still needed multiple named attacks to finally defeat Hybrid Queen, meanwhile Aramaki could overpower both Queen and King (who should have recover most of their strength due of be Zoan users) while not using any of his named attacks, even Big Mom with amnesia could easily overpower Zoan Queen with just her natural physical strength without Haki.
he sensed Aramaki's power and was still disappointed that he didn't get to fight him after Shanks interrupted.
When Aramaki retreated Sanji only say that him and the
other Straw Hats didn't need to help Yamato and the Red Scabbards, i don't see how you can interpretate as Sanji wanting to test his strength or believing that he can fight an admiral alone.