If your son is 6-4 throwing 91-93 whats the problem? If he was 5-5 throwing 74 on an undefeated state champion would that be better?
Coaches dont recruit teams. They recruit players. If he is playing against other players going to schools like this he is getting exposure. If he is 6-4 throwing 91-93 then they know who he is and could careless how bad the team is he is playing on.