Is there a reason we never see this for teams that have depth at RB? If you always pick the best talent available and then adapt your schemes accordingly, there'll be times when you have more RB depth than WR for some teams. And then if you have a good running QB? There'd be some real damage you could do spreading everyone thin.
For example can you imagine the havoc you could wreak on a 4-3 if you've got a play action with one tail, a screen/ late slot route on another, and the QB following him? The only guy that can stop a running QB in the first five yards a few seconds into a play action is the OLB, and if he's tied up with a tailback running in his zone, or the tail helps block, or runs a slot, how much free room does the QB have to run or dump off a pass? Would it freeze defenses on that side of the field enough for receivers to get open deep or one-on-one with the safety?
Just curious why we've never seen Carolina try using Cam's running talent in this way (or Tebow for that matter)?