Late getting to this news, but on Wed. the team signed Omar Stoutmire and released running back Marcus Mason. Mason takes the place of Anthony Trucks on the practice squad; Trucks had a strong name but little else, apparently. The news is devastating for Ben, who had grown attached to Marcus Mason and convinced me to believe. Ben also addresses the roster rules should someone try and steal Mason off the PS:
In other words, if a team decides they need some depth at tailback and like Marcus Mason they can offer him a contract but the Redskins have the right to keep him by promoting him to the roster. If they do not he signs with the other team.
As the official site notes, we had a good reason for this move:
Prioleau has a hamstring injury while Fox has a groin injury.
Best of luck to Marcus Mason. Hopefully one day he'll get a better shot at the roster.