FRISCO -- Twenty-four months ago, Dak Prescott was backing up Jameill Showers who was backing up Kellen Moore who was backing up Tony Romo.
Then the Cowboys' quarterback depth chart, as well chronicled, changed rapidly in 2016.
Moore, the veteran, fractured his right ankle at training camp.
Romo fractured his back in a preseason game vs. Seattle.
Prescott rose the ranks, Showers eventually flipping not just positions but sides of the roster. He now plays safety for Dallas.
Troy Aikman‘s not worried about Dak Prescott filling Cowboys leadership void in life after Witten: pic.