IMO Nesbitt was much better in year two than year one. Tevin was probably better off because he got several full games of experience his first year. And it's just basic logic that players get better with experience vs sitting on the bench. If he loses his confidence then he shouldn't be the QB going forward and we'd be better off knowing that this year than finding it out next year. I doubt it will swing things by 3 wins because I don't think our D will be worth a damn and our philosophy on offense is still flawed, but IF our defense does make a big jump, then not having a first time starting QB could make a big difference. And, if we have a real QB battle next year then having seen TO in an actual starting role will be useful.
The thing is it is about potential. There is the potential that the experience this year will help down the road. TM is all about this year, and this year I don't think he provides us much more than TO. It's not entirely his fault, but he's a senior QB with only 3 years in the system. He only has one more year of experience as a QB here than TO anyways. But 3 years less eligibility. He probably gives us a slightly better chance to win this year, but it's a chance at what? A slightly better meaningless bowl?