There was so much discussion about the New York Giants adding a running back in the draft, particularly with their interest in Jeremiyah Love during the draft process, that it was weird to see them not select a running back at all. So when they doubled back to sign former New Mexico running back Damon Bankston as an undrafted free agent, it made all the sense in the world.  Regardless, this Giants running back room will be difficult to penetrate. They have five guys who have been with the organization and have served well in their roles. The three most important pieces—Cam Skattebo, Tyrone Tracy Jr., and Devin Singletary—make up the predominance of the carries in the backfield.  Eric Gray and Dante "Turbo" Miller are primarily special teams players. So the question becomes if Bankston has what it takes to usurp one of those final two guys or actually penetrate into the three-deep of this backfield?…