My son has already gone through the Express program and in the 4 or 5 years that he played with the Express I never saw players moving between one team to another within the grade. There were some kids occasionally added after the tryouts but even that was pretty rare and nobody ever played for two teams within the grade. Once the summer started (usually the Forsberg tournament) the rosters were set and no kids were added or subtracted. This must be something new that they are trying and it sounds like its unsettling. I hope it's temporary or somehow works out ok for all. Enjoy the ride while you can - summer lax used to be fun and stress free. Something seems to have changed.