User blog comment:Soulreaper1234/Urahara says Fusion Aizen says Subdue/@comment-1268838-20100510175658

I'm just not buying the idea that Aizen is truly in control here. He claims that he is subduing the Hogyoku, but look at the way that the orb is enveloping his body. It looks more like the Hogyoku is subduing Aizen. I think that both Aizen and Kisuke were right - Aizen and the orb are fusing, but whichever one subdues the other is the one in control of the transformation. I guess overall, my theory is that the Hogyoku is trying to subdue Aizen, giving its will a material body to utilize. This would be the very reason that the orb "allowed" itself to be stolen. It might just be me, but the way Kisuke looked at Aizen during their conversation seemed to imply that he is aware of the Hogyoku's plans.