Board Thread:Questions and Answers/@comment-27210738-20151113205526/@comment-25593389-20160409112938

Ichigo in his dangai form wasn strong but not so much either it's just that Aizen was weak, I mean the only thing that make Aizen strong is his Zampakuto who can manipulate others trough illusions, if the captains of the 13 divisions weren't under his power he would have been crushed like a bug by them, if we list those who could have killed him, there is a lot of people : - Yamamoto - Kyoraku - Unohana - Ukitake - Yoruichi - Urahara - Tessai - some of the Vizards

All of these people could have crushed him if they had used their Bankai and if Aizen hadn't traped them into his illusions.