User blog comment:JadenLan/White Fang swirl design/@comment-25396609-20150831164310/@comment-25555436-20150831170538

The basic, mook-level members's Grimm masks are the ones that don't match a specific species.

The higher rank members, likely they use more Grimm-like grimm masks, if they so want. WFLieutenant's kinda looks like the Goliath's, at least to me.