This conversation is one of the many reasons why club lacrosse should move to age-based. Use calendar year, or Sept 1 to Aug 31, it doesn't matter. But just play like against like. No more drama or bad blood, and more even competition for a larger pool of kids. A super team can just play regional tournaments against other super teams, or play up. Dominant kids can play up if that is what the parents want. A much better and more predictable way of having kids (especially ones from different regions) compete, get better and have fun.
