- #90
Why let Byakuya live? He has no zanpakuto if he ever awakes that would be worse than death...
You just answered your own question.
The most prideful person in whole soul society just got reduced in completely powerless state - physically handicaped to never be a shinigami again and mentally destroyed by As Nodt. Someone who WOULD WANT to have died because existing after all of this is far more horrible for his lost pride.
If its handled good, tons of character development for both him, Rukia and Renji are possible from this.
At first I hated that he did not die, but the more I think the more it seems that there's far more potential in his pitiful existence than in sudden death.