User blog comment:Flamesword300/AIZENS NEW FORM/@comment-1712587-20100604084738

it's difficult to really say his power level since his opponents befor he fused were either extremely battle weary and using Bankai (Sajin/Toshiro) or only in Shikai. Aizen said himself that Yamamoto was actually more powerful than him but because of that used WW to take away his power and ultimately used a cheap trick to disable him. the only Shinigami he really took on toe to toe was Isshin and he got his arse handed to him. Since going Aizenpod he made Uruhara use his Shikai and Yoruichi eventually used Shunko, but still no release from Isshin. I would say that Isshin's Bankai should be able to stand up to Aizenfly. and judging by the enormous gap in power between Ichigos second hollow form and the Segunda Epata form of Ulquiorra i would say that the hollow would be on par or more powerful.