He worked with a guy who Chip Long knows.
I feel he is over thinking which makes him hesitant to pull the trigger independent of his accuracy issues.
A few observations about the offense re Book vs Wimbush. For some reason the offense seems to move faster with Book running it and he is much more decisive and quicker with his decisions than Wimbush. There is clearly more misdirection with Mack's TD as one example. Even if the counter runs aren't necessarily working well, they give the defense more to worry about and open more receivers. It certainly helps that Williams should be scaring the shit out of defenses from now on.
There appear to be more sprint out passes getting Book outside the pocket than Wimbush has. I don't know if that is a function of Book (he is smaller and needs to be out of pocket and/or throws better on run that Wimbush) or a reflection that Book runs the offense better than Wimbush. While Wimbush is a stronger runner ( surprisingly Book seems more nimble in the pocket), his runs are anticipated by the defense limiting the effectiveness of the RPO with the defense pressing the pocket rather than worrying about Wimbush passing.