CatsPop,
First of all welcome. Did I read correctly that your son is a 2018? If so, does that mean he is around 13 years old?
Nothing wrong with a desire to attend a certain college, but there are things to consider, especially if he happens to become a very talented player.
Often the in state schools will not make their best offer to the in state player. This is especially true when the college knows the player has a strong desire to attend their college. So even if your son has decided where he wants to attend college, I wouldn't make that well known.
If the potential financial package is of any importance, in state colleges offer in state kids that they want based on how much demand there is for that kid. Getting the best in state kids is important to most every college recruiter. If they can get the kid without spending much money it's even better.
So he might never change his mind about attending only that school, but he sure can increase his value to that college if he has some other options. My suggestion is to keep his desire to himself for awhile. If other colleges show interest, see just how interested they are. If other colleges are interested in him, it's likely the school he wants will be more interested in him. And at his present age, there's always the possibility he might change his mind.
BTW, Nava attended more than one college. In fact, he might not be where he is today had he not attended more than one college.
Best of luck