User blog comment:Lia Schiffer/421: Deicide 23/@comment-1432572-20100923003844/@comment-1248963-20100923005034

Kisuke did create the Hogyoku, it would be absurd he was completely oblivious to the true capabilities of his own creation (we did have a huge discussion about it when Aizen first said so). And as Mohrph said, he implied back then to have much more knowledge about it than he let out. I remember how excited I was and I'm not disappointed with the outcome. Besides, Urahara understands Aizen's behaviour and his goals, it's very logical that he would predict he would try to fuse with the Hogyoku