I guess a reason why it matters if kids from A teams join B teams in tournaments is that it skews the results of contests which then skews team rankings-not that that really matters--other than screwing up seedings and brackets for larger tournaments and grouping teams appropriately. Connecting a lot of dots here on a slow day.
Congrats to Manhasset. Credit where credit is due. I agree that they are the top town team certainly on LI. I'm from a rival town and have not seen any team better or deeper than them up to this point.