I have been pondering long hours and i wonder..... How, when the time comes will our heros beat Aizen. He is most likely a hybrid now and his zanpakuto is freakin unbeatable. I can't see how ichigo, his dad, anybody in gotei 13, ishida, or the group of part hollows training ichigo wil beat him. I think KT has made Aizen a bit too invincible. The only one who could do it is tousen, and he doesn't look like he is changing sides anytime soon.