Here's my summary of the Cowboys QB school this season:
1. Dak is playing this season for his future as a Dallas Cowboy. If he leads the Cowboys to the SB this season, I can see the Cowboys extending him and Trey Lance will be the #2 backup starting next season.
2. No matter how well Dak plays, he is always potentially one injury away from being the next 2016 Romo, meaning losing his starting job to a younger QB prospect. People forget that Romo was one of the highest paid QBs in the league at the time he got hurt and lost his starting job. If the Cowboys needed to move from Dak, they can make it happen. But as long as Dak is playing at the level he is playing right now, he'll keep his job.
3. Forget about Cooper Rush. Even he understands his limited athletic talent and relies on his NFL experience and IQ to make it in this league. He may be on the Cowboys roster next season as the 3rd back emergency QB, but other than that, the #2 backup belongs to Lance and I can think of 5 million reasons why.
4. Of all the Cowboys QBs, as far as the long term future, Trey Lance is in the drivers seat, not Dak Prescott. Stop listening to the whiners who say Lance is an unknown, blah-blah-blah. Don't worry about that. McCarthy knows a thing or two about developing QBs and will get this kid ready. Ask Brett Favre about whether McCarthy has the balls to move on from a franchise QB.