User blog comment:Soulreaper1234/Urahara says Fusion Aizen says Subdue/@comment-1248963-20100508070543

The thing with Aizen is that it will never occurr to him that something will happen that he could've never "prophetized". That's how big his ego is. So he most likely has no idea of what he is turning into. He believes that he's breaking the division between "the divine and the earthly", because that's what he thinks is his desire.

But I gave it some thinking and I came with a couple theories. Indeed what Salubri says is important, Aizen is not as concerned about the Hogyoku's actions as he should be. If the orb has a will of its own, I would've never put that thing inside me, honestly.

My first theory is that Urahara has mastered the Hogyoku. He said he hadn't done so in the past, and left the sentence hanging in the air. Maybe a tad too obvious? Yet a bit too misterious. Perhaps the Hogyoku has always been tricking Aizen into believing he's his master, obeying to Urahara's desire (maybe that's a bit too farfetched, just like all of Aizen's plans). Perhaps now the Hogyoku will start to follow Urahara's desire... I don't know, that unfinished conversation left me with many questions.

My other theory is kind of CLAMP like. Anyone familiar with Clamp's X, you know, when Fuuma asks Kamui about his true wish and Kamui says "I want to protect the world where Fuuma and Kotori live", and Fuuma says "That's not your true wish blah blah My mission is to make people's wishes true" (usually in a very bloody way/ destroy the world -dear, Fuuma is the Hogyoku). So, anyway, maybe becoming "god" is not Aizen's true desire, and Aizen doesn't realize that, so he'll turn into something else?