McFadden ran for 152 yards and a touchdown on 29 carries in last week's loss to the New York Giants, grabbing hold of a job that has been mostly handled by committee with Randle getting the most carries, but McFadden, Lance Dunbar and Christine Michael working in.
"We use our eyes to evaluate them," coach Jason Garrett said. "We don't use our ears. We use our eyes. We've given these guys chances. Are they taking advantage of it; are they warranting more opportunity? That's what we tried to do. When someone really grabs hold and says, 'Hey, I want to be the guy,' we're going to give him more chances. We'll do that at the running back position, but really we do that at every position on our team."
McFadden is coming off his first 100-yard game since 2013, his most carries in a game since 2012 and his most yards in a game since 2011.
How much of a workload he can handle is a question because of the injuries he has battled in the past. Only twice in his career has he had back-to-back games with at least 20 carries.
"It was good to see that he had it in him," Garrett said. "Once he got going in that ballgame I think we all felt that, 'Let's keep giving this guy the rock.' I just thought he played really, really well in the game and took advantage of an opportunity. I think his impact on the running game was significant. Obviously we blocked them as well, and there were a lot of opportunities for him, but if you watch him at the end of runs, the end of the inside runs, the end of the runs off tackle, at the end of the runs out in space, I think you see what he's all about."
Randle suffered an oblique strain on his second carry against the Giants and did not return. He is not practicing today but is wearing full pads as he goes through a rehab session on the side.
If he can't play, then the Cowboys will have two former Seahawks as McFadden's backups: Michael, who has been active the past three games, and Rod Smith, who was claimed off waivers on Oct. 14.