User blog comment:Theory of everything/Wesen Evolution?/@comment-63.230.16.71-20130723071351/@comment-1509826-20130723145314

Unlikely, all on occasions they've drawn a vey strong line between Grimms and Wesen. Plus it seems somewhat redundant for a purely human wesen to exits. I think Grimms are somewhere between the worlds of Wesen and Man, beings who stand on the border, designed to interact with both worlds.