User blog comment:Xilinoc/Ch. 664 - The Gift/@comment-11506376-20160302214407/@comment-2220112-20160303223805

I think Mauyri tried to copy his Bankai with his most recent bankai upgrade. Uraharas bankai must allow him to evolve his fighting technique or sword in some way violently to overcome an enemy. Until now he hasn't faced an enemy that actually forced him to go all out.