They have to use him as they did in the series of plays from the 11-minute mark to the 7:58 mark in the 3Q.
Book is not a pocket passer. He's proven he's not and I don't know why Kelly keeps trying to force him to be one.
It's much like what the Pro's did with Michael Vick. Book has proven at his best when he can scramble around, throw on the run or pick up 4 to 12 yards with his feet. He's never going to be a pure dropback, pocket passer. Stop trying to force it and just let the kid be what he is. He'll never be a pocket guy and he doesn't have the confidence to do so either (see happy feet).
Year 1, 2018, this is how they called the offense for him - to his strengths and the offense was very productive. Scored a lot of points.
Year 2, 2019, forced him to be a pocket passer and supressed his instincts until late year he just said screw it (I believe it was the VT game).
Year 3, 2020, looks more like 2019 than 2018. Kelly needs to quit trying to force him into Kelly's offense and play with what he is which is not a dropback passer.
It will be hard to win the games we need to if this offense drifts back to slow-paced and only averages roughly 24-28 pts per game. You need to be in the mid to high 30s to have continued success in CFP, IMO.