My understanding of that situation is somewhat different. The boys were told that if they only wanted to be on the premiere team and not on the challenge team they could ask for that and they would be given an answer when the rosters are posted next week. If they would consider the challenge team then there would be one roster for both and the final rosters would be announced after regionals. I think they expect every boy to want to be on the best team they can. Some may choose to roster at a different club if they don't make premiere.
This makes sense and the coaches have to know where the existing players slot (repositioning slots based on season) and are using tryouts/evaluations to slot new players that show up.