PAL is the lowest common denominator for lacrosse on Long Island. It should be inclusive. There are numerous other outlets for your future D1 star to go play if he wants a more robust experience and not be with his town friends whether they can or can't catch and throw. Definitely no reason to separate prior to 5th grade. Lacrosse is a skill game and the skills of the B/c players younger than 5th are not there to carry a team on their own.