I suppose, but the point stands. Ichigo was comfortably beating aizen and based on urahara's explanation aizen was growing weaker as he fought. Ichigo used the final getsuga tensho for no reason other than because kubo needed an excuse to rid ichigo of his power. Dunno why he just didn't make aizen stronger against ichigo tbh...I think that was supposed to set up Kisuke.
If Yama wears black then it's game over. I think Ichibei's ink hax is >> Yama's bankai. Though both should've kicked Yhwach's ass but then Almighty bs came along.
Byakuya IMO is the 3rd strongest captain after those 2. Shunsui is the CC, has high battle IQ and like you said, his bankai is broken. Though all are relative I'd say.
I don't know why Renji didn't become a captain but he's definitely strong enough for it. Shinji isn't necessarily a combat fighter though. He's more maneuver and hax. Toshiro is wierd. Was losing pretty badly to Bazz-B but then had powered up greatly against Gerard.
Like I said, the top 5 are agreed by mostly everyone. Ichigo, Yhwach, Ichibei, Yama and Aizen.
Royal Guard as in Squad Zero? Yea I don't buy the whole Squad Zero combined is stronger than the Gotei 13 combined. The only person that individually beats them all is Ichibei with the exception of Yama but he's gone.
kinda, but for that to happen ichibei's ink has to either resist or affect yamamoto's flame. if its ink you'd think the fire around yamamoto would get rid of it.... Then again, maybe ichibei can write on incorporeal things. Honestly, we just can't know.
Honestly, it's just shikai to shikai I see byakuya winning the fight. And byakuya probably has the stronger reiatsu in general... To me its just bankai where there is some ambiguity here.
Honestly, I could see squad zero combined being stronger than the gotei 13. it's at the individual level where i think things get weird... you have ichibei, nimaiya, tenjiro, kirio and senjumaru on one end... And in the gotei 13 when the arc started you have yamamoto, suifeng, rose, unohana, shinji, byakuya, komamura, shunsui, kensei, hitsugaya, kenpachi, mayuri and ukitake... Out of those the strongest ones were without a doubt yamamoto and unohana and shunsui being worth a mention. but at the time a single royal guard could have taken out 4 or 5 of them (depending on which one). It's through training and shenanigans that the captains kinda turn the tables a bit. byakuya through royal guard training, kenpachi becoming well stronger than unohana even without shikai...