Ok, here are what I can think of as the pros and cons of the following concept. When you have two QBs who are close in talent, it should be the practice to play the starter for the first two or three series and then have the backup play for a couple of series. Then stay with the QB doing the best.
1. Could mean less likelihood of winning the game that day. The increased amount of risk of losing that day would depend on the talent difference between QBs. The backup needs to have clear starting potential. Between JN and Jaybo, I’d never try to develop Jaybo. But for Vad versus TW or JT versus Vad, I would definitely play the backup more. This year, JT versus Byerly will be very close again if JT doesn’t start passing a lot better.
2. Lessens the continuity for the offense to get into a rhythm.
3. Would mean less practice time for the starter.
4. It’s not conventional wisdom. Losses would be blamed on non-conventional practices to help preserve the conventional wisdom. CPJ dabbled in this area this year, but didn’t fully commit. With Vad bolting, it has to be a regret that he didn’t develop JT more. But hind sight is 20/20.
1. Competition between players is good – makes both players better.
2. Develops the backup more for the likely injuries (or quitting) by the starter. Improves depth and robustness of the team for future games.
3. QBs play better against some teams than others. QBs have good days and bad days. This helps find the right QB for that day.
4. In our rushing offense there are many more hits on our QB. While this doesn’t often end in injury which prevents play, it does result in degradation of play and decision making by the QB. Alternating QBs results in the damage being spread out more.
5. Most other positions have a substitution, especially more physical contact ones like linemen and running backs.
6. The D has to prepare for more looks.
7. Allows the QB not playing to watch from the sideline and see what the D is doing better (CPJ has used this as a reason).
8. It gives us something to talk about.
In a generic discussion of playing one QB vs two I generally agree with your pro and cons. However, in this particular GT QB discussion we have two virtually equally talented and two uniquely different QBs in things like explosive speed, toughness, endurance, and maybe turnovers and passing. However this year Pro 4 tells the story and IMO dominates the other pros and cons. Spred out the licks so we maximize the chance of JT staying healthy and speedy for the duration of the season so he has the opportunity to make those big plays we are all hoping for. Use Byerly's unique toughness when it helps us in possession downs, in the red zone, and in death march. If one of the QBs becomes decisively more effective, then a one primary QB strategy is in order. Until then I believe we will see two QBs.