User blog comment:Xilinoc/Ch. 591 - Marching Out the ZOMBIES 2/@comment-9282993-20140730125729/@comment-5693502-20140730130326

Bambietta was seemingly severely weakened by the explosion prior to the Arrancar arriving and also one would assume that Mayuri made some enhancements to the FrankenArrancars. So Charlotte appears to be much stronger.

Hitsugaya probably died shortly after defeating Cang Du. If not, then Giselle killed him before zombifying him.