People in the roleplay can theorize however they want, but until that stuff's canon, we're so far not having a direct link between Grimm to Faunus. While we'll prolly discuss possibilities and hammer down a definite thing during a Storm of Brains, I'm not in the boat of Grimm having become regular humans. [i]And[/i], I'm also in the boat that Fauna [i]were[/i] mentioned in the Creation myth, in that they're [i]also[/i] human and part of mankind. So, funny ears aside...yeah, also regular people. :P

That's not to say that ancient Grimm won't have some relation to mankind, they just may not have turned into a race is all. :P