its a jump comic, nuff said about the quick turn around and shit.
any1 ever think that the reason you have a 1000 years of training is to get bankai which makes you much stronger? ichigo did the urahara method which made him get bankai much sooner. dont forget ichigo has more spirit power as well.

anyway byakuya is overrated, he isnt even the strongest of the captains. id rather see the battle between the old man and the other two guys.