User blog comment:Theraven22/bankai's that should be revealed/@comment-44061-20100330201014

I dont know how many times that it must be said by the next step in altering perception is not altering reality. Perception as Aizen's shikai works is a mental function (creating illusions via sight), its banaki would have to work within the realm of mental manipulation. The manipulation of reality works along scientific lines. They are two worlds apart for reality alteration to be his bankai, probability alteration would have to be his shikai.