Fwiw, and don't shoot the messenger, but
The NFL network's Jason LaConfora claims he's considered around the league to be one of the young rising stars in the coaching ranks.
Another very important point is that they say if you expect an NFL QB coach to be the one to correct a QB's footwork during the season, you're completely unrealistic.
The labor agreement limits coaching time and the week is dedicated to inserting the game plan and practicing.
QBs hire specialists in the offseason to work on mechanical things like that.