Board Thread:General Discussion/@comment-24382631-20140110234616/@comment-24939865-20141206093841

This is all quite interesting. And I believe it was possible for Soutaicho Yamamoto to defeat Aizen in his first Hogyoku Transformation, the Chrysalis state. As those of weaker Reiatsu were able to hurt him, or at least break away at the shell, and if he were to be decapitated in that state, or in any state, I doubt his Regeneration could support that, as his Hollow Regen wouldn't be able to replace such an intricate piece, and the best way to kill a Shinigami is by decapitation. But after he ascended to the wingless Butterfly state, his Reiatsu was much too high, and not even noticeable unless as stated above he allowed others to feel it, which would crush most by the sheer force.