"His versatility. His abilty to catch. To protect. When you sit and meet him, his knowledge of the game of football as a runner," Lewis said. "Knowing where the unblocked guys are, why they are unblocked and understanding it, the discipline it takes to play the spot. He does it all. He makes people miss. He's shown the versatility to do all the things you're looking for in that guy and he can be a three-down player if he needs to be.Marvin Lewis on Green-Ellis being the back they wanted.