At this point there's probably not much you and he can do other than tough it out and hope for the best. You're not going to change the coach. You just have to deal with him as best you can.
Your statement that he "had to" pitch in winter ball puzzles me a little. Are you saying the coach requires them to play winter ball, or frowns if they do not? It really sounds to me like he may need some time off. Rehab is great, but it is not a substitute for rest.
quote:
He rehabbed from that and got his arm back to as near full strength as he could given that he had to start pitching for the winter ball team and had to start finding his control. Unfortunately, although his velocity was up about 3 mph from back in July he never quite got his control back and struggled with his control during varsity winterball.