That, I actually don't fear.
I'm convinced that Napier did what he did this year to get Lewis as ready as possible for next year just in case all we brought in were a couple of freshman qbs. Don't recall if he played every fourth series from Game 1 onward, but in essence, he got 25% of the snaps this year. To me, that's good enough. With spring training he'll be as ready as he'll ever be.