I am not an expert on lacrosse by any means, but I know first hand about how serious and specialized FOGO players are from a young age.
I coach travel ice hockey and I had a boy on my team for 3 years(Pee Wee/Bantam) who was a tremendous athlete - good size, speed, tough and motivated. He played multiple sports, but lacrosse was his favorite.
He was a mid-fielder for an elite lacrosse club team but as he grew, he really became an expert on face-offs. This was to the point that he started specializing and began competing very successfully in national Face-Off competitions in the 6th, 7th and 8th grade. He would miss hockey games to compete in these Face-Off competitions.
Unfortunately for me, this year he finally gave up hockey for good to concentrate on lacrosse. Although I think he should have continued to participate in multiple sports (an argument for another day), he is already on the college radar as a freshman FOGO specialist. I have no idea whether he will eventually pan out at the college level, but I know his club has already been getting inquiries about him.