User blog comment:Xilinoc/Ch. 579 - THE UNDEAD 6/@comment-29183117-20140507174805/@comment-5693502-20140507193938

I would hate it if Grimmjow has a Segunda Etapa. I'm sure he could power-up normally like everyone else (just like the Tres Bestias). Not to mention, that form seemed to be there only to showcase Hollow Ichigo's immense power, not as a natural part of Arrancar evolution. I may well be wrong. I hope I'm not. Also, despite Ulquiorra saying the Cero Oscuras was "their" Cero, he was the only one seen using it.

Apart from that I'd happily welcome Grimmjow back to beat them up. He is one male character who has no qualms with physically beating down women just as much as men, so he'd be perfect to face them.