Yammy just isn’t stronger than Byakuya, you haven’t proved any of that, you just stated your headcanon. You’re not even speaking proper English. Also, if you read Tsukishima’s profile or even read the fight, you’d know that Book of the End can enable Tsukishima to grow stronger by inserting himself into a past where he trains. Also, Ichigo’s Fullbring surpasses his old Bankai which is Res Yammy level. Ichigo’s Fullbring Bankai is tier 5, way above Yammy. None of your points support your claim at all. Please read the profiles again.
I disagree with what is written in Ichigo's Fullbringer AP description.
1) How do Ginjo and Tsukishima know how strong Ichigo was with the powers he used to have?
2) Even if Ginjo says he surpassed Shinigami powers, that would make Completed Fullbringer Ichigo>Shinigami Ichigo against Grimmjow at most. Ichigo needed both Bankai and hollow mask to defeat Res Grimmjow. Ginjo hasn't even seen Ichigo using his Shinigami powers.
3) Are Ginjo and Tsukshima characters who can read power levels?
Ichigo's form against Yammy was weakened. He just got out of the fight with Uluqiorra. He also has his Hollow Mask when he hits Yammy. Later, when he is caught by Yammy, his Hollow Mask is gone.
Considering Yammy's size slowed him down, it makes sense that Byakuya was able to stand up to him. Despite the huge speed difference, Byakuya and Zaraki were covered in blood by the end of the battle.
as I mentioned before Kisuke is getting stronger as the story progresses anyway.
As far as I understand, you think that the character is stronger than before in Fake Karakura Town because Urahara's AP explanation is a misinterpretation.
1) Aizen and Urahara were never mentioned as equals. When Aizen said "our powers are no longer equal", he meant that I am a being that surpasses Shinigami and you are still a shinigami. The word "power" is not used in the sense of AP here. If Shikai Urahara is at Aizen's level anyway, why was Shikai Urahara inadequate against Askin? He felt the need to use Bankai against Askin. Even Grimmjow had enough AP to penetrate Askin (Only as AP, he would still lose to Askin in a possible fight)
CFYOW It is stated that Grimmjow is still weaker than Barragan and Without Hogyoku Aizen>>>Barragan.
2) Aizen's statement "If it wasn't for the Hogyoku, I would have died" is said because Aizen's attack was used against Aizen. Urahara doesn't do it with his own AP.
But I agree with this point, Urahara's Kido AP could be Aizen level.
So it would make more sense for Urahara to have 6-B Physical and 5-C AP with Kido.
Another important point is that Aizen knows that there are people in the Living World who know their strength such as Shikai Urahara, Shunko Yoruichi and Isshin, but he still sends Uluqiorra and thinks that Uluqiorra can return without dying.
Holding Back Base Uluqiorra deflected Urahara's attack with his bare hand without even using a zanpaktou.