The size of the school has nothing to do with it. Athletic programs thrive because of the culture and strength of their youth programs. He is a very good coach but would not have the same success at many of the large schools because of lack of talent or lax IQ . 200 graduates or 2000 graduates means nothing if you have 15 good lacrosse players.
You have a lot better chance of finding 15 good lax players at a school with 2000 graduates than a school with 200 graduates.
There's not a school on LI that has more than 5 good players (IE game changers) much less 15, it's just the reality of HS sports. Pequa has a great middie and goalie and not much else they will win Nassau and probably LI championship