I know that one of the DE spots in a 4 man front is usually more of a run-stuffer than pass rusher, and that Mo "can" play the position, but I'm not sure that he's ideal for that. I think he's better suited to play DE in a 3-man front. I'm not sure that he's either fast enough, or has enough pass rush moves to be an ideal 4-3 DE, but could be wrong.