Just like in the game of cards, jokers are amazing weapons in football because they don’t fit into the book easily when it comes to figuring out ways to defend them.
It is often used to describe the difficult to handle tight ends, but I think we can also list the running backs who aren’t actually running backs. Darren Sproles, Reggie Bush, maybe even Randall Cobb, and yes, the Cowboys hope, Lance Dunbar is at least a “poor man’s” version of that. He is listed as a running back, but if we judge him as running backs are judged, we will quickly be underwhelmed with his running the ball (especially inside) and his pass protection. Both are just not up to the NFL grade.
This is a very detailed story breaking down Dunbar's strengths and weaknesses. The article goes on to say the Cowboys remain convinced that his role must be expanded as a weapon used in ways that are simply difficult to account for by a defense. The author added Dunbar as a runner has a 2-year track record of A) not getting the ball as a RB and B) not being productive enough to compel the staff to give him the ball more. But, he pointed out a Dunbar-led attack helped to knock off Seattle on the road last year, however he wasn't used much after that. The story also says his pass protection is suspect and the team doesn't appear to want to simply hand him the ball as a RB. He's capable of big plays, but probably not consistent fantasy points. Joseph Randle is ranked 24th on our RB list and is expected to at least split carries with Darren McFadden.