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and what if he doesn't get into Stanford?
Dude, that's not an easy school to get into, even for Div-I sports prospects.
When you apply to colleges, do you just apply to one? Or do you apply to a bunch? If you don't get into A, you go to B, etc, etc. Does this really need to be explained for you? If your top choice is Stanford, you'd be a complete idiot to apply *just* to Stanford.
Div-1 athletics is messed up because kids have to give coaches commitments or their classes will fill up. That's just how the game works, and on top of that he has to get into the school, it's no given. He has to cover all his bases, for him. If he has no backup plan and doesn't get into Stanford, what's he gonna do? If he doesn't commit to Stanford and their class fills up, what's he gonna do if he really wanted to go there?
I don't see how you can possibly deride that as selfish or "using" Nebraska.