I would bring back KG at a mediocre salary with this understanding. He will be a Coach on the floor and when he decides he no longer wants to play, He will be Doc's assistant Coach on the bench. And he will be in the King Seat to be considered to be Head Coach here if Doc leaves or will have the experience to command a Head Coach job elsewhere should Doc remain. I can't think of anyone who would be both a better defensive Coach and a better big man Coach.
Be respectful and keep it clean. Thanks.