Board Thread:Questions and Answers/@comment-27210738-20151113205526/@comment-26091912-20151117033410

Considering how Ichigo absolutely mopped the floor with Aizen in the FKT arc, he would've completely annihilated Bach, in my opinion.

But as far as we know, the "Dangai" Ichigo was only a one off, one time only plot device to advance the story. And as of the current arc, with Ichigo achieving his true power, it most likely (hopefully) won't be making a return.