IMO Allen's escapability, arm strength, and size/durability make him our best option.
It's kind of weird given that he's a rookie and yet the edge goes to him b/c the line and weapons suck...but he is the one w/ the tools to compensate. Of course, he'll be a turnover machine but at least there's a chance to make some bigger plays to move the ball and score.
If our offense were in better shape I would give the edge to Nate instead, but it isn't.
IMO, we should scrap the playbook and go out there and run the read option w/ McCoy and Allen and try to hit some crossing routes and deep shots if it works to move the ball on the ground. We should basically run Urban Myer's Tebow offense.