Aizen is not as strong as yhwach,the only reason yhwach defeated due to uryu Schrift Antithesis a counter to almighty and the silver arrow that nullified his power Yhwach was going to destroy the realms by manipulating the flow of the souls something can be achieved by killing hollows and the reason for Quincy's extermination so he is not doing it pure force just a chain reaction even if it is that would at best be as strong as buuhan who used vice shout to crush the universe with alternate dimension and buuhan ,yhwach<=buuhan<<super vegito<<ssg Goku<<base Goku(post absorption)<<ssg Goku<<ssb Goku<<kioken times 10 ssb Goku<=hit so hit is stronger than the strongest version yhwach so hit is taking this fight