Here's the precise moment the Cowboys' 2015 season went up in flames: Week 2, when quarterback Tony Romo went down with a fractured clavicle. He would return in November before suffering another shoulder injury, but by then, the damage had been done. Dallas finished 4-12 with Brandon Weeden, Matt Cassel and Kellen Moore splitting the majority of the snaps.

The lesson: Backup quarterbacks are a luxury but they're also extremely important for a possible playoff team.

Weeden and Cassel are gone but Moore remains, though he's now sidelined with a broken ankle. It was enough to lead to speculation that the Cowboys were eyeing 37-year-old Browns backup Josh McCown.

But following Sunday night's scrimmage that included 2015 undrafted free agent Jameill Showers and 2016 fourth-round pick Dak Prescott, owner and general manager Jerry Jones may have a change of heart regarding the need to bolster the quarterback depth chart.