I can't comment on football specifically but my son (8) just finished his 3rd year of travel baseball and I can tell you for a fact that the kids he plays with/against are far and away better than kids in normal rec leagues. It ain't even close! I watched a few rec league games this year and parents were tickled pink if little Timmy caught a pop fly at 8yrs old! My son was catching them reliably by age 6. Travelball kids are looking to turn double plays and can recite to you the correct play given various situations. Their IQ is so much higher and it carries over toward middleschool.....
....push for changes.
I don't discount the effect that you're speaking of with respect to baseball in particular. I don't happen to think that it applies as well to football, though, and also don't think it'd be a great idea for the younger kids to be playing football year-round, etc.
I guess that I just don't think that the early years influence football development nearly as much. I personally know guys who played in the NFL and never wore a football helmet til 7th grade and who never played anywhere other than at school. But, I don't think I've ever heard of a great baseball player who didn't play from as old as he could hold a bat, either. I've also coached a lot of T-ball and peewee football and just think the kids are learning and developing a lot more baseball at those ages than football. And there's no doubt, for instance, that the all-star level kids (more similar to travel team level) are a world apart from the average t-baller.
Regardless, I don't deny that year-round playing would improve some players in football. But I also know that the guys I know who were great never played like that and would've still been dominant if all of the lesser-talented guys playing around them had years of extra practice. Just wouldn't have mattered. May be that football relies a bit more on raw athletic ability (speed, strength, power) and that baseball skills are more fine and able to be developed over time (fine motor skills, pitching details, etc.). You might learn to hit better after 1000 swings, but if a guy can run a 4.4, you won't ever practice enough to catch him if you're a 4.7 guy to start with.
But I agree completely with you regarding baseball and the effect of early development. I think the skills and development are just vastly different between football/baseball.
As for OSU, I never said that white guys can't compete or be great at D-1 levels. If they're good enough to be recruited to a school like OSU, they are great players, period and race doesn't matter. TN has great D-1 players, white and black. Just not in the numbers as the more populous states.
But the observation about a kids race versus potential D1 football ability just matters when applied to overall populations. There are many, many more black kids at the D-1 football level than white kids, but there are very many more white kids to start with. So, it seems apparent to me that if you have similar overall populations (TN vs AL), but disparate white/black ratios, that the number of D-1 level football players is likely to be different too.
Oddly enough, I would also disagree completely that this observation applies to baseball. It simply does not. And TN is a much better baseball state than football, I think.