Board Thread:General Discussion/@comment-24356010-20131230021257/@comment-3422208-20140121230015

This is just my theory, but like any other spiritual beings it depends on the amount of power one possesses. Remember that after Aizen's imprisonment only 2 Espadas were left Harribel and Grimmjow (not counting Neliel who is an ex Espada) so there was not many strong hollows that could fight the Wandenreich. Even though quincies cant absorb hollow powers they are still stronger.

The vizards on the other hand have both hollow and soul reaper powers. So they could have hollowfied to fight the quincies. But they probably just didn't get the chance too or like mentioned earlier the Quincies have become more powerful even more than the vizards.