how strong is azien if he can just catch Ichigo sword in banki form with his finger
Aizen HAS to be a vizard . . . even before he left for HM!!!
Heres why:
He was able to stop Ichigo's and Komamaru's sword with his hands
erm he could catch Ichigos sword with only 1 finger because Ichigo fought Byakuya 1 minute before with the rest of his powers
(Ichigo said by himself he puts everything he has into the last attack)
Same with Komamura who fought against Zaraki earlier - and he got an open shot to Komamura (he used his Illusion to confuse him before he used his Spell)
Same with Renji who was outpowered and heavily wounded in the fight against Ichigo AND Byakuya!
And Hitsugaya got trapped by his illusion (and he just fought against Ichimaru where he wasted a lot of power too)...
So Aizen always was at 100% while he fought against his
(mostly outpowered and exhausted) rivals . Please do not forget this very important fact!
He's a tactician genius who plays with his marionets...