Get your son's coach to call them.
Their roster is posted and they have players from all divisions including a CC. Most summer teams have turnover at the beginning of the season with injuries and players who quit. I know that SLC usually get their players as recommended by coaches. Many never see the field as freshmen at their college. College coaches esnd some players to get bats and innings in. I have also moticed that very few return to the team they played for the year before. Not sure why.