Clearly Ridley is the number one and Woodhead is the primary passing down/spread back. So the question comes down to Vereen or Bolden, but I see each as having unique skill sets so I think there’s a place for both of them.
As for next year Woodhead’s contract is up, so it comes down to whether or not they think Vereen can take that role. Personally I’d love to see them bring Woodhead back and go into camp with all four running backs. Injuries are too big a factor at that position to discard capable backs.