So what are the expectations for a backup QB?
I'm sure it's different for every team based on the talent level and experience. I'm not just talking about the quarterback.
I've always felt that when your starting QB goes down, the team and coaches must step up. The results are more about them than the backup QB.
Remember, when the backup steps into the game he isn't going to be in rhythm with his offense. All season long, the starter got the majority of reps with the 1st team. I think that during the time the backup must play, the basic expectation is that he doesn't lose the game. That is, he must first concentrate on not making the big mistakes that cause turnovers or spoil an opportunity to score.
If the starter is out for a long period of time than the expectation may increase based on the status of the backup. If he was a starter for some team in previous seasons then the team might expect more as the season progresses.
However, if your backup is a 3rd day draft pick, journeyman, or even started in the league as a undrafted free agent, then it is up to the team to step up. The running game must take on more responsibility, the coaches must accelerate their coaching of that backup, a game plan must be devised to reduce the burden on this backup if the team hopes to be successful during that time. The defense must come together and commit.
Last season Andy Dalton was 4-5. Over the previous 9 seasons combined, a backup QB lead the Cowboys to a win only once. That happened in 2015 when the Cowboys defeated Washington 19-16. With 9 seconds left Dan Baily kicked a 54 yard field goal, his 4th of the day.
So, prior to the 2020 season, from 2011 to 2020, a Cowboy backup started 17 games and went a combined 1-16. The QB's were Brandon Weedon (0-4), Kellen Moore (0-3), Matt Cassel (1-3), Stephen McGee, Kyle Orton and Mark Sanchez (last three were 0-1).
The reason for having a backup QB isn't because the team is required to put 11 men on the field. You have a backup QB so the team can continue to compete. regardless of cap restraints, availability, or talent level. This is on management and coaching. Without a realistic plan in case the starting QB goes down, the Dallas Cowboys are always going to be one hit away from the season ending at any point in their schedule. We know this. We've lived it.
The solution is obvious. In order to prevent this, the Cowboys must have two viable options for a starting QB. How do they accomplish this? Again, obvious. Since you cannot pay two starting level QB's, one of them must be in a rookie contract. He must be a draft pick of that team.
Now when I say "viable" I mean they must have the talent level to be a legitimate starting QB. That doesn't mean they have to be a 1st round pick. However, the lower you drop in the rounds before you draft a QB, the less likely you will find future potential starters.
The Cowboys must make a habit of drafting a QB in the 2nd or 3rd rounds once every three years. This accomplishes more than just a quality backup. It creates competition regardless of the starter's talent level. It creates "contract leverage" with the starter. It creates the potential for lucrative trade value. It creates cap relief.
The Cowboys have never been one to spend serious draft capitol on a backup QB but the evolution of the offensive game and the subsequent, increasing importance of the quarterback position demands it.