Lee will be serviceable, maybe even better than that.
He won't be good enough for some fans, and we'll lose a close game, or play a weak team too close, and there will be clamoring for Green or Washington to start, because some fans know that the best player on the team is the #2 QB. I can't predict exactly when this will happen, but the over/under line is halftime of the opener.
This will be made worse by one of them looking good in mop up time in an early game.
Bo will tells fans that Lee is the clear #1 and is by far the best in practice.
Some fans won't believe him or think he doesn't know what he's talking about.
Possibly Green or Washington will get more quality time in a loss or if Lee takes a hit and has to sit for a few series, or the rest of the game. The new QB won't play well, but not quite a la Beau Davis in Lubbock.
Lee will finish the year strong and prove Bo correct, but some fans still won't be satisfied.