aizen wins with low difficulty. even if gin does go bankai it wouldnt help. ichigo was putting up a good fight against bankai gin. the same ichigo that coudnt touch base aizen
That was not Gin's Bankai. Also that was new Hollow Ichigo at Bankai. If Gin would had actually go Bankai on Ichigo, Ichigo would had been erased from the top part of his body.
@DBZ_universe: its the same exact bankai, just one ability he didnt use. ichigo had trouble dodging it but he stil managed to block and dodge most of the attacks. aizen is way faster than both ichigo and gin. he would never touch him. Gin also knew this, thats why he had to use a sneak attack
@FormerCrimsonKing: Gin was toying with Ichigo the entire time. He wasn't serious in the least, not to mention he wasn't even trying to kill him.
The fact that his poison worked on Aizen while Soifon's poison didn't, implies his rieatsu was a league above an average captain.
Gin stated that he had to go through this entire series waiting for that one chance to actually use his bankai on Aizen because he knew he wouldn't be absolutely sure he would be able to land a hit otherwise. A Gin fighting an Aizen who knew Gin was his enemy wouldn't stand a chance by Gin's own words.