User blog comment:Xilinoc/Ch. 666 (NOT YET RELEASED)/@comment-9282993-20160317113347/@comment-9282993-20160317154848

Didnt urahara say that their reiatsu becomes full hollow again AFTER aizen ripped off their masks...? So i think you're mistaken there. They become arrancar after they have their masks removed. So maybe there was a mistake in the translation?