Right now with all the injury problems the Cowboys have they are goign to go lone on O-line and LB. No way are they going to carry all these backs. Pollard, Dowdle, Luepke and then also Vaughn. Not happening.
Next, the team has to be operating on offence in a good way to use a player like Deuce. If your O-line is bleeding like a leaky sieve why would you shore up your weaknesses with an undersized player? That is insanity.
If they can get this o-line stable then there is a chance to get the offence rolling, and then have defences off balance to a point where a rookie like Deuce could gash a defence that is chasing a high powered offence.
Now that Edoga has been carted off, and Tyron is being Tyron I don't think there will be any chance of any rookie offensive player seeing the Dallas lineup unless the regular season game is meaningless.
MM doesn't have a leash long enough to let him play with the possibility of losing Dak to injury. If Dak is down, then MM is fired or let go. So this year the coaching staff is rolling with the most experienced players to protect their chances of getting a new contract.