While I fundamentally disagree with allowing the kid to win the job this year, always a great read Windy.
I think prior to the draft, I would have agreed with you, but a scout changed my mind.
What I read from the scout was that he always would prefer to let a QB sit a year. The reason is because no matter how polished, every QB comes into the league with bad habits, and if you give them a year to sit, so long as you are steadily working with them to get reps and practice, you can essentially forge new muscle memory that will hold when they are finally ready to start - it becomes ingrained in them.
However, if they start too soon, all that hard work comes undone as soon as the QB faces pressure and hardship, and their old muscle memory surfaces, which is in this scout's opinion, why some guys bust out or go to hell as soon as they hit some real adversity. In his opinion, a year is enough to make it all second nature, even in adversity, and at that point it all becomes about whether you got the right guy mentally (can he read a defense, etc). But he strongly felt letting a QB sit for a year gives the QB the best chance to succeed, so long as the team who has him continues to invest that development time into him the year round.
I have to say, it was a very compelling case and made total sense. As such, I am on the "keep Mitch benched no matter what" bandwagon for this year, and my plan would then be to try to trade Glennon in the offseason, and barring that, make it an "open" competition for 2018 with the expectation the kid takes it from Glennon.