If the coach knows the incoming players from LL or travel (whatever feeder pipeline he has), he should already know where you son will play or not play (right or wrong, he should have an opinion already). If you just moved, that's a different story. Take the gear just in case and then split, find a hiding place and watch, but don't get caught. Is your son stressing over it? Don't add to it, just be prepared as best you can. The more options your son presents to the coach the better chance he has of making the team. The rest will work itself out during tryouts, inter-squad, scrimmages, and games.