We had the same thing happen at our HS, the coach was a good guy and knew how to play the game but he sucked as a head coach but was a good assistant coach. You can get him removed if all parents stick together as we did and met with the principle and athletic director with several pages of concerns about the program. He was asked to step down which he did and the next coach that they hired won a state championship the next year with the same players and assistant coaches. We never made the playoffs with the other coach. It takes a special person to be a good head coach and when you get one you better pay them well or they will leave and go somewhere else.