I was against letting Murray go, but I realize that it was a salary cap decision (for the most part), and I can live with that. I was really worried about us going with the running backs we had on the team, but hoped that McFadden could help us out some.
Without having the benefit of hindsight, I understand why the Cowboys felt like they could get by with what they had at running back. I think the coaches hoped that Randle and McFadden could be serviceable since they planned to use Dunbar a lot more this year. They actually used Dunbar, and to the coaches' credit, he was actually getting results. The problem with a small player, like Dunbar, is that they tend to get injured a little bit more frequently, and can't really be used with frequency as a between the tackles runner.
I think the Cowboys weren't happy with what they had on the roster, which is why they traded a draft pick to get Michael. I think if Dunbar had not suffered an injury, there would have been two possible outcomes, which are:
1. If Michael is capable, then he and Dunbar would split a majority of the carries, or
2. We would have eventually ridden Dunbar as hard as we needed to in order to get wins, much like we did DeMarco Murray last year.
If Romo had not been injured, we could have been more judicious with Dunbar than without him.