I do think breaking out at an early age has some predictive value. I also think Kevin White, being a JUCO transfer, might be a fairly obvious exception.
I also think that if White improves his route running and proves that the strengths he already has will translate, no one will care that he's not as young as Mike Evans or even Amari Cooper were as rookies.
A Bears coach recently said that they have certain body movements they look for on tape to tell whether a WR will be able to run the full route tree. White obviously did. We'll see.
And this is where the rubber hits the road. I am now a White owner and reading the loved feast is fun, but are there any recent examples of players that successfully transitioned to the NFL with as little experience as White? In that respect I associate him with Corelle Patterson--not in terms of style of play, but in lack of playing experience. Lots of the same things were being said about him. Can someone site a player that had NFL success with as little experience as White?
The other issue I have in this thread when I hear "he can learn some skill with coaching." This assumes the player did not get any coaching at his college. This is flat out wrong. Every major college program has a WR coach, even two, that are very capable.
Patterson did even less, in terms of routes run, than White and lived almost completely off his reputation after the catch, of which he had less than 50, and had trouble with his hands, period. He was also an excellent returner.
White caught over 100 balls his final season, tons of them downfield. He has very good hands, good contested catch ability, good (but not Patterson level) RAC ability.
Really his only question mark is routes.
College offenses ask certain players to run certain routes. White was not asked to run certain routes at WVU, and Bears coaches have specifically said they saw everything they needed to on White's tape to show them that he was capable of running the full route tree once he learns.
If you think all college programs have WR coaches that teach the entire route tree, I don't know what to tell you. They are not trying to prepare these guys for NFL success, they're teaching them what they need to know to succeed in their particular offense, and that's it.