This is EXACTLY what a good head coach does, DELEGATE. All during the week Rex will put together a game plan, hand it off to his coordinators, and let them get the job done. That's what the good head coaches do. Rex oversees all aspects of the game, not just the defense. Look at Mike Tomlin in Pittsburgh, or Harbaugh in Baltimore. A d-backs coach and a special teams coach. They don't call plays, they pick great coordinators to do that. This is what Rex should have done all along.