Got it. This is a thread on "Cal South 2004 Player Pool Announced". There are at least a couple of girls on the '04 player pool list that play up on '03 teams. And are possibly good enough to make an '03 DA team ... if they choose to play up.
I also get it that a kid being the standout on a team her own age, doesn't necessarily help her development. And she doesn't have to be "a future YNT player" for this to be the case. If she's good enough to play with them, and can handle the size and speed difference of the older age group, why shouldn't she be allowed to play ... even at DA level.
I realize this is DA you are talking about. And it applies to DA just the same as your local club. There are reasons, other than the parents ego, for kids to play up. If you believe U.S. Development Academy, one of those reasons is it accelerates their development.
"The Development Academy's 10-month Program allows for a greater opportunity to institute style of play and implement a system according to U.S. Soccer's Development Philosophy. It also gives teams increased opportunities for younger kids in their club to "play up" against older players in both training and matches, thereby accelerating their development."
So if the kid is good enough to play with them, and can handle the size and speed difference of the older age group, let 'em play. One of the outcomes may be that the player (and parent) learn that they are not quite ready for it.