10 opt-outs, Covid year, no offseason, etc. You can't really assess his abilities as a head coach with such a small dataset. He's only been there 3 years, and 1 year was obviously Covid. First year was undefeated, and the second year (IIRC) he lost his star QB and still had a very impressive season. Personally, I'd like to see what he'd have done with 5 or 6 seasons at that level.
But he's still consistently produced on the offensive side of the ball everywhere he's been. There's enough data to show that, at multiple levels. There's possibility if you pair him with a strong DC that we could field some good teams. But as we've discussed ad nauseam, hiring a head coach is a crap shoot.