That would certainly be amusing to see, but that would have to say quite a bit about Gin's hidden talents or something be even more dangerous than Aizen. It would be an interesting twist, though I'd suspect that a lot of fans would probably find Aizen's end coming at the hand of Gin to be a little disappointing after everything that has happened.
I think just about anyone would get the feeling from Gin. He has a presence that does not really set will with others. It would be pretty easily for Rukia not to sense anything wrong from Aizen considering his abilities. The reason he is so dangerous is because it is impossible to break through his illusions once you're under them.
That said, Aizen is a pretty big cheat with some difficult to believe things.
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