Carolina's running game was amazing the second half of the season with very little overall offensive talent.
Their QB situation speaks for itself, their RB's were JAG's (although I'd love it if we replaced Elliott with Foreman on a cheap deal), their WR's were terrible outside of Moore, and their OL was full of JAG's outside of a rookie in Ekwonu and maybe Corbett.
Moore was literally the only player on the roster who is anywhere near a Pro Bowl caliber player.
So long story short, we know McCarthy is calling plays, if we brought this guy in as some sort of trumped up RB coach/run game coordinator with the title of "OC" I think that'd be pretty solid.