Nope, rosters were set before tryouts
And how do you know?
Absolutely rosters are penciled in prior to tryouts. Top team talent doesn't just appear blindly at try outs. The coaches know the players they are looking to keep from the previous year and know the players they are looking to replace from the previous year. The coaches know of players on the teams below and who will be considered to be brought up, and know of, or are aware of the top kids trying out from other clubs. This is due diligence and and every good coach will have a plan worked out prior to tryouts. This holds true at least on blue because these players do not appear out of thin air.
