User blog comment:Godisme/Deicide 23/@comment-2220139-20100922225230/@comment-1774413-20100922225724

Aizen wasnt defeated, he was regenerating. Urahara said that the Hogyoku no longer saw him as a master as he was weak, since Aizen almost died at the hands of Gin and wouldve been defeated by Urahara if not for the hogyoku evolving him then you can say that they both had as much to do with the hogyoku seeing Aizen as weak, as Ichigo did in the end.