I mean JJ came in behind a guy in Egbuka that's a likely first rounder this year and another 5* talent in front of him that people at OSU were/are extremely high on in Tate. Came in and made people forget all about both of them and lead them to a Natty as a TF with Will Howard at qb, while posting 1300+ yards and 15TDs.
He was the only true freshman to be granted the insurance policy, has draft experts talking about him being the #1 overall pick if he declared as a freshman, and finished top 4 in yards and TDs as a TF.
I don't think people saying him being generational is anything to do with him being a SF kid.