bb313 - welcome to the hsbbweb
Those are some tough thoughts and not sure if I have the right answer. Reading between the lines, it sounds as if it is believed your son was possibly stabbed in the back by an unethical coach? Here is my very small two cents. I know there are two sides to every story. I'll give you one possible other side. Some parent learns that when a college coach was in the building, the coach that was giving lessons to her son aggresively promoted her son to the respective coach. That parent might be praising the guy if that is all they knew of the story. On the other hand, I can understand your feelings and I may very likely feel the same way. If that coach was aware they were there to see your son, then I think there is something to be said about that. If he was merely looking out for his guys and had no knowledge of your son's situation, then you may want to let it go at that.
Look at the bright side, a college coach came to see your son. If one coach likes him, I am sure others will like him as well.