When he's healthy, he's very good and a clear upgrade to Greene. But he's injured quite frequently, has a lot of foot issues. Plus who knows what type of money he is looking for, we cannot afford to throw any money at a RB in free agency.
For the right price he'd be a good get. Can catch a little out of the backfield, good pass-blocker. Biggest thing is that even though he's hurt a lot you can count on him to absolutely dominate one or two games a season. That means something when your other options are Bilal Powell and a draft pick.