Jimmy Johnson knows a thing or two about running backs.

He had a pretty good one during his days with the Cowboys in Emmitt Smith.

Johnson believes his former team again has the best running back in the league in Ezekiel Elliott.

"Ezekiel Elliott, there's no telling what he can do," Johnson said. "I know this. When he hits that line, all of a sudden that pile goes about 5 yards, and when he breaks into the open, no one wants to tackle him.

"I think he's the most talented back in the league."