You would know that he would have had to ace the ACT to stand a chance. He wanted to go to a PAC school, but that one non-Q spot each PAC school gets is going to a sure-fire prospect. Nobody thought he had enough top end speed to be worth that one spot.
Generally, when a school takes a non-Q, they immediately try to test the kid for a defined learning impairment which could allow for alternate testing modalities or an immediate NCAA waiver. Failing that, they sit out a year.
No one thought Dayan was going to qualify and none of the PAC schools wanted to use their 1 non-Q spot. His status at BYU in year one would be undetermined until the learning disability waiver stuff was complete, and that’s why his status would change after enrollment.
Not qualifying is a private matter, but Dayan was open about it so I use him as the example. It’s pretty easy to figure out and connect the dots on others though- and even easier to figure out Utah’s since they only get 1 per year.