User blog comment:Xilinoc/Ch. 591 - Marching Out the ZOMBIES 2/@comment-5496403-20140803003927/@comment-11051098-20140803100144

We could also consider the possibility that Mayuri enhanced the Arrancars' strength when he revived them. Fighting against captain-level opponents like the Sternritters, I would bet that Mayuri would use every trick he could come up with, when the world's basically at the stakes in this war.