Board Thread:General Discussion/@comment-24382631-20140110234616/@comment-31121580-20180424184010

yamamoto is a Peak Shinigami meaning he is not a God/transcendent level tier in spiritual power/reitsu, meaning his attacks are all fodder doesnt matter what ability he has his fire is powered byy reitsu thus becomes useless in front of aizen, Yhwach, or any Transcendent level Being

Transcendent> Shinigami, it has been stated several times already, Yhwach after absorbing mimihigi and soul king was wary of ichigo who had regain his power the power he used against aizen and Pre god Tier yhwach was tied to Ichibei who is stronger than yamamoto. so take that into perspective, Aizen became a True Transcendent Being after he became Butterfly Form, his Monster form gave him power comparable to Dangai Ichigo and his Chair Form which most of his power is sealed is so much lower tier shinigami get erased by being near him, Kubo use the significance of Caterpillar into Butterfly to tell us reader that he is evolving from a Mortal/Shinigami To God

Lille Barro after his 2nd Volstandig told shunsui that he was the closest of the SR to God meaning Transcendence and we know how powerfull that dude was in his 2nd form. Yamamoto and Ichibei are both Limit of the limit of what a Shinigami Reitsu can achieve, Aizen was weaker than yamamoto but not by much or did people forget the dude tanked yamamoto hado 96 with only slight burns, aizen power was stronger than all Espada combined he said so himself, Yamamoto Bankai While strong is only effective against those Beneath Transcendence as his Reitsu is nowhere near the same Quality or quantity as a God it means if his bankai were to touch Aizen it would get cancelled out by Aizen monstrous Reitsu or his finger