I don't think the process is as objective as your words might suggest, at least from what I can see in AZ. One club here seems to get the largest number of regional ID looks. They are not dominant nor are their teams. For U15 they have 6 players (I think) going, with the next best represented being 3. The latter team beat them 4-0 last season. They do not have 6 players in that age group at YNT level or close, if they did, they would be a dominant team. In fact, their best player plays up on that team and is not going. Mind you, the best player on the other team mentioned also plays up and is not going. It seems to me that some clubs with good contacts get their players in the regional pools. I expect some objective viewing at that point separates the wheat from the chafe.
IMV, clubs should have nothing to do with any YNT talent selection - US soccer can't afford the scouts though, so some clubs, IMV, game it to promote themselves, their brand and to encourage players to stay.