Oh lord, I wish I could find the article!
It was a while ago, but it was a study out of ... Michigan State (?) that looked at the bottom 10% of students that got into the elite colleges. Not the legacies and the athletes, they controlled for that. But, based on selection criteria like ACT, SAT, GPA, etc. Kids that got in, basically, on the strengths of their essays.
The press article talked about a kid that was in Stanford. He was from Arizona, and his grads were iffy and his scores were okay-ish.
But, the kid was SUPER passionate about the local state park that he hiked in all the time. He managed to raise a bunch of money for the park to keep it open through the 2008 downturn, he went to the state capital and lobbied legislators, all that jazz. The kid essentially applied to Stanford on a lark and wrote about his efforts with the park. He got in.
The conclusion of the study of these kinds of kids was that they were really spiky and not well rounded. And, they really didn't need Stanford and all the others, Stanford needed them.
Sorry for the years later recollections and likely misremembering. If anyone else knows the source for this, I'd love to know as well.