Miami RB situation

Drake and Williams are both on waivers and I got a spot I can fill with a running back. There seem to be better options like Collins, Darkwa, Brieda. Standard 10-team league. I have not seen either of them play this season. I seen A-train make some good runs for MIA. Any thoughts on this unit going forward, Drake seems to be the analyst favorite. MIA gonna run the ball, even with Cutler in. They can still win some games and one of these RBs is gonna get lots of work, maybe like Abdullah, they get touches and no TDs