User blog comment:Morgan silve/Aizen vs Kariya, who would win?/@comment-1393830-20101010173727/@comment-1268838-20101010181626

Just as he said. Even if Kariya were Aizen's equal in terms of sheer reiatsu (and he most certainly is not), Kyouka Suigetsu alone puts an immense power gap between them. Regardless of whether he knows it is an illusion or not, it would be impossible for Kariya to fight properly while under Absolute Hypnosis. Aizen has been shown to be fully capable of cutting down captain-class opponents with just one hit.

Aizen > Bankai Ichigo > Kariya