WOW, you just wont give up, I personally have spoken to Coaches from all the major programs and they will all state the same fact. No team will ever just replace everyone. When teams have tryouts, they are looking to fill the positions that have the lightest talent. All kids have a fair shake, if one is better trhan the other,, I assure you the kid will be picked.
I have been told numerous times from True Blue that no kids are safe, all positions are open, but kids must be better than the existing players to make the squad.

TB is turning out to big a big program that has to adopt the philosophies of the other programs and pick the best kids. That is why this is a fair tryout