User blog comment:Kamiryu/Ha ha Aizen got stabbed by Gin./@comment-1906999-20100802225512

I'm sticking with my theory that the hogyoku, which has it's own will, will take over Aizen in a similar way that Shirosaki did to Ichigo against Ulqui. Whether or not he'll be able to break free of it is yet to be seen.

If that turns out to be wrong, then I'll go with #6 also. Even though that'd be incredibly lame and would make me wanna cero myself <.<, it's the most likely option.