Recruiting not a science nor does any coach have a crystal ball. Hundreds of kids each year get passed over by FBS who are or develop into excellent players capable of playing at that level.
Did a quick scan of SEC,B10 and ACC. More than I thought but overall a miniscule number. Over 160000 HS players graduate each year.Less than 2500get FBS schollis. With partials FCS. gives a few more. A very smsll window for players seeking to get a schollie playing football. Also,a huge number for even 250 teams to mine all the talent therein for themselves.