4 crucial things we learned in Cowboys' preseason finale vs Raiders

The Dallas Cowboys ended preseason with a bang Saturday against the Raiders.

Dak Prescott called the shots on offense in a surprise shake-up from Mike McCarthy and Dallas routed the Raiders 31-17. Preseason finale or otherwise, scoring 31 points in your debut as a play-caller is quite the feat for Prescott.

All in all it was a successful night for the Cowboys, who got through the night unscathed in terms of major injuries and saw continued growth from players on the roster bubble. In turn, though, that means McCarthy and company will have tough decisions to make before Tuesday's roster cutdown deadline.

Let's get into four things we learned from Saturday's preseason finale.

4. Will Grier belongs on an NFL roster

Do the Cowboys have the deepest QB room in the NFL after they acquired Trey Lance from the 49ers? You'd be hard-pressed to name a team with more talent. As a result of the trade, though, Grier was essentially fired as Dallas' third-string quarterback.

Assuming the Cowboys don't find a trade partner for Grier -- fans on social media jokingly pushed hard for that throughout the game -- the former West Virginia standout will be released as part of Dallas' roster crunch to get to 53 players.

That said, Grier proved Saturday he belongs on an NFL roster. He finished 29-of-35 (83%) for 302 yards and four total touchdowns. He added 53 yards on the ground and had a 100% completion rate in the red zone.

Say what you will about Grier facing the Raiders' backups, but that's a tremendous performance regardless of circumstance. It's hard to imagine the former Mountaineer hasn't earned a shot with another team after Saturday night.