I disagree.
For this offense, trying to pound teams on the ground with this offensive line, it's futile. That's setting up the offensive line to fail, the running game to be stagnant, and too many hopes of having long, penalty-free drives. The recipe for success is the Ram game plan, with tweaks depending on the opponent's defense and key matchups. I see no recipe for success on offense that includes some RB getting 25 carries mostly between the tackles. Those are wasted plays, IMO.
And I'm not giving up draft picks just to have a big RB to get first downs in short-yardage situations. I just don't think it's worth it.
Hec, instead of getting another RB, how about getting an offensive lineman to help create a hole? If there's even a sliver of a hole, I do believe Pollard or Dowdle would find it and get some tough yards. Many times when the Cowboys RB gets the handoff, there's a waiting defender right in their face because of a missed block. Expecting Henry to come in here to make something out of nothing running between the tackles, I just don't see it.
The Cowboys have more pressing needs, like offensive linemen and a LB.