User blog comment:Schiffy/BG9: Man, Machine, or Something Else Entirely?/@comment-8840393-20130920010321/@comment-11051098-20130920135049

There's no saying that BG9's mask is its actual face.

Ever since they first appeared, I've been on the though that both Äs Nödt and BG9 could be powerful Arrancars, wearing those masks to cover mask remnants, maybe similar to those of Harribel and Yammy.