Hmm, I didn't think of it like that. Most likely though it seems the speedier legs might be the ones to choose due to the torso's being where character specific powers would lie.
Then again, characters like Flameslinger and Drill Sergeant do have powers that utilize their legs. So who's to say whats really going to happen.
EDIT: after watching the gameplay video (thanks, legendofskyland for that), it seems the legs of each character will do some unique moves as well, so you would have to review each leg/torso individually it seems.