User blog comment:GinIchimaru/414 : Gin Rebels/@comment-1405841-20100730011957

Well to look at it at a logical sense, he could have done it LONG before Aizen reached his Complete Form. At any given time mind-you, but it may be that Aizen was far too cautious at those points that attempted Regicide (since he wasn't really a God back then) would have been useless...besides, Tosen was around (which makes me think that Tosen was PROBABLY truly loyal to Aizen and if Gin killed or attempted murder on Aizen, then Tosen would have come after Gin).

Actually, when you start looking at it...almost every time we see Aizen he's surrounded by those that are loyal to him...so where could Gin make a move? I think it's funny, because Gin was the "suspect" back in the Soul Society arc whenever Aizen faked his death...and now he's actually sealing the deal for real this time. Even back then, he was surrounded by people who TRUSTED Aizen...which wouldn't have ended well for him either.

So really, I'm left with this theory...

This is a game of chess, Aizen took out the black pieces long ago with their King (Ichigo) still safe...but a majority of Aizen's white pieces are gone as well, leaving just him and Gin right now. Gin was waiting for Aizen to take care of all the opposing pieces and keep them out of the way, so that he himself could take out Aizen and create the Oken by himself. Thus, Gin being the antagonist theory. Like I said, everyone's out of the way except for Ichigo and Isshin...but we can't be for certain how this will play out now that Gin is alone.