My point: the classmate thing is always touted as a reason the kid may come, but it doesn't seem to have much influence on kids choosing ND.
The Atkinsons were brothers.
God told Manti to come, though I'm sure Toma helped.
I think Fertitta being the alpha-male son of the billionaire owner of a fight league makes the situation unique. "Im flying in a private jet across the country of an unofficial, wanna come?"
It seems choosing ND is always primarily a decision you make for yourself. You follow friends to State U if you are looking for comfort level.
The year apart thing is a completely different dynamic, that is a lot bigger deal in my book. That's a guy you looked up to in high school, and now he's thriving in this new atmosphere and inviting you in. That really helps with the introduction to the school.