I wish him the best. You are blessed to have a talented son.
Things will work out for him. I ended up going to USU and it was a great option for me, but I wasn't a football player. USU knows how to handle Missionary recruits. You should give them a call. For certain it is a place where he can at least walk on. They have historically had some pretty great coaches there. I hope BYU works out, but worst case scenario he will get a college education somewhere else.