Cowboys insider Todd Archer believes RB Lance Dunbar's role would expand only "a little" in the event of a DeMarco Murray injury. Dunbar goes just 5'8, 188 pounds and isn't built for a feature-back role. If Murray goes down, Archer believes either Joseph Randle or Ryan Williams would become the "every-down back." Dallas only figures to keep 1 of those guys, making it an intriguing training camp battle to monitor.