I do not see any poster essentially sizing Book up for his “gold jacket”. As typical, you are grasping for straws, for whatever the reason.
He may be something special, or could be a dud. I care to believe somewhere in the middle and hope he is a star. All said, I am not expecting much from him. I hope you expect he does well.
The unique opportunity this presents is that we now get to see Book in meaningful action with something on the line without having lost another starter to severe injury.
I also don’t expect much, but if he can manage the game and let his skill set shine when needed, it’ll be much more useful to coach in evaluating his future than any preseason film would.