Norv helped Alex Smith get back on the right track to save his career as well. He's perfect for this team. Bringing him in would remind me of the Texans / Saints / Packers and how they brought in a coordinator to save their team on that side of the ball. Notice how two have raised the Lombardi Trophy and one may do so at the end of the season.
HC that can get his players to respond, and a coordinator to help fix issues on that side of the ball that the HC cannot do.