This.
For coaches to even sniff a job at a big P5 school they have to know the ins and outs, top to bottom. The amount of film any of those guys have analyzed and torn apart is mind-boggling. A lot of folks think positional coaches live in a bubble of that position which couldn't be farther from the truth. Do you really think LeVar just sits back and plays Angry Birds on his phone until there's a punt or FG attempt?
Watch all the coaches next time you're at a D1 game. EVERY single one of them has a job, every single play...no matter what it is and no matter who has the ball. All of those guys are coaching and involved, 100% of the time.
He knows every single play and formation, and he's on the exact same headset frequency as KF, BF, and Phil, and has been for a whole lot of years. He knows the system and the game.