You are right - while the invites come directly from Jake, he certainly has a trusted network of high school and club coaches who he solicits input from. Whether or not there are "dedicated slots" I can't say, but to think he does this in a vacuum in foolish.

I just saw him at the 3d Blue Chip in Florida, and at best he was a passive observer of the the kids playing their four games. While the invite says Jake and Jamie they are obviously relying heavily on the two evaluators. Jamie is a lot more tuned into the games.