User blog comment:Soulreaper1234/Urahara says Fusion Aizen says Subdue/@comment-1248963-20100511073059

Neither do I, a crack theory is a "theory that is derived from baseless information that is not supported by the actual material". Aizen says the Hogyoku has a will of its own. Aizen's theory says that the Hogyoku can "materialize" the true desires of those around it. But that is still a theory that he believes he proved through the "Vizard creation", Rukia's transferring her powers to Ichigo, and the birth or Orihime's and Chad's powers (I'm still not buying it, too many holes in that story). And Aizen believes he has subdued the Hogyoku and that it is now responding to his desires and materializing his heart, but the truth is he can't be certain of what that thing is doing with his body since it has "a will of its own". As I said in one of my first posts in this blog, his transformation looks like the Hogyoku is taking over Aizen's body in a pretty parasitical way.

It's pretty hard to tell what's going on with Aizen and his fusion-whatever at this point, but judging by the dark look Urahara had, it's not going to be pretty. Maybe saying the Hogyoku will become an "enemy" so to speak is going a bit overboard, but the possibility of the Hogyoku "backstabbing" Aizen seems very plausible at this point. Can't wait for 403