L. Bell, Latavius Murray, Mike Tolbert, DeMarco Murray, etc... all would likely have converted. Mike's a good player and can run inside and outside the tackles but he's not really a short yardage back, like not really at all. Actually Blount doesn't have a stellar conversion percentage either but its much better on fourth down than on third down conversions. I don't think the Pats have a short yardage back on their roster.