What kind of advice are you looking for? I know I am new and naive and haven't lived through this stuff, but you are talking about your 10th graders High School Team...does it matter? Don't most scholarship offers come from what the kid does on his travel team and at showcases?
It sounds to me like whether these coaches know what they are doing or not they want to give your son a chance at playing in a position he isn't familiar with, isn't that a good thing? Don't you think it might improve his ability to read the ground balls, which you say he is week at?
What am I missing?