Judging McC based on having Favre and then Rodgers in GB isn't a good application. I do think he wants more balance and I think he told Elliott that and he seems to be rearing to go.
Got to be a little tough on RB's when they see the new HC coming in is a WCO guy because they do not really stop to think about that offense, they just think about the QB that ran it.
When McC converted Montgomery to RB from WR, I was surprised at how much he called runs. It's not lost on McC that his successor used the run with Aaron Jones, much to the chagrin of his QB who thinks he runs the team. He saw another HC have better success than he did using the same players, just using them differently.
Prescott is not Rodgers or Elway before Shanahan arrived, he is used to a balanced attack and was forced into playing Air Coryell ball and his RB having fumblitis didn't help.
Elliott is still a star RB in the NFL and I believe McC is going to use him to achieve that balance, along with a mix of Pollard in there. Healthy, the Cowboys have a good OL and a couple of really good RB's, why not use that to set up the passing game?