Aizen came to the human world with two lietanants and three top espada. Yes, the odds in terms of strength in numbers is against Aizen but we can never underestimate two things. They are the top three espada which means that they can be more for the captains to handle one on one. Maybe two on one will do the job but SS doesn't have that advantage. Second of all, Aizen and his two dudes. When they come out of the fire prison, they'll be fresh and fit as a fiddle while on the other hand the captains will be dead tired or very near to death (if one of them dies, i'll eat my shoe). Uptil now, its Aizen's game.
The situation changes when the Vizards intervene. But what we don't know is who will they favor. Yes, it seems they are leaning with SS but again two things should be noticed. SS were the ones who banished them from the place altogether with no fault of their own (talking about th vizards). Secondly, Tite is a tricky SOB and he can pull off some really weird and surprising stuff. So all we have to do is play the ever boring waiting game. If not, u people can start chewing off ur arm in anticipation and work ur way down
