User blog comment:Salubri/Aizen, Yamamoto and Wonderweiss/@comment-44061-20100226170119

Why use something that doesn't work. Even if you did it would serve no point if you dont know if your target is actually your target. Thats the point just because you have something you dont use it all the time. It is stated that bankai is there trump card true enough. But in this circumstance because of Aizen's shikai even them using their shikai has become pointless. Whats the concept behind showing a bankai thats useless in the situation. Hence why alot of people voice their frustration at how overpowered Aizen's zanpakuto is. Thats why I question whether those that want to see them are calling for them just because they want to see them as it wont do anything to help or progress the story any. Least it be forgotten Aizen and Gin have both yet to use bankai themselves. The difference with getting crushed while using shikai or bankai, either way does nothing for the story and largely makes little sense. You dont use a nuclear weapon if you dont know if it will be affective and it likely wont especially if you cant find the target. It has already been affirmed that the only one thats a Aizen is threatened by is Yamamoto and thats without even him using his bankai. Shinigami battles are battles of reiatsu Yamamoto is the only one stated with power greater then Aizen, so anyone else using bankai wouldn't matter.

Also Mayuri's wasn't ineffective Szayel just happened to have a power that would bring him back, Mayuri's zanpakuto worked fine for its purpose, though it is correct it wasnt responsible for the espada's final demise. Zommari did pretty much get fatally injured by use of Byakuya's bankai as well. Though it was a simple slash that was the killing blow.