So why aren't they doing that now?
If Tulsa decides President is by far and away the best QB we have, under your theory we would play Skipper against Central Arkansas. To be safe, we wouldn't play our starting linebackers either. Then we trot out the talent against Texas for a shock and aw campaign.
Currently teams play their best players, regardless of their year. They want to see how they perform in real games, they want those players to improve, and they want to win. If they wanted to, a team could hold back its best players and surprise a rival all they want. But that doesn't happen.
Why would it be more likely under the new rule?