I believe that money drives everything...however
1- see the attached excerpt from SCYSA website
"ODP Make up dates are for players who are injured (need doctors note) or players who have a commitment to their soccer team, league game or tournament, that have been scheduled prior to the posted tryout dates. All players need to make an appointment so we can have coaches in place for the make-up date."
2- no idea
3- as with 1 above... it is heavily dependent on the age group. At the younger ages they may make 2 teams instead of one...for sure the 90 age group will be one team... most likely in the 18 player size.
