It's hard to honestly pick one school that has produced a plethora of "stars" in the NFL at a certain position. Sure, you have one or two star players, but no one school truly dominates the NFL at a position in this current state of the game. Back in the day you could say USC produced some good talent, and Miami as well, but nowadays you have a thousand times more recruits and special players with how preparation, training, and strength programs have progressed where a guy can come from a D-III school and outperform a D-I All American. It's so hit or miss with a bigger pool.
I suppose Julio is the closest thing we have to being called the best NFL player, but Amari Cooper has so much talent he could end up being an all-time great. Hightower, Mosley, and Barron are the most NFL dominate at LB with the most talented of them all, Rolando McClain, going belly up. Obviously running back has been incredible at Bama and the heart and soul of our offensive approach. I hope this is the year they let Henry run, so far his NFL career has mirrored his one at Bama. When Ingram re-signed with New Orleans I quit feeling sorry for him. Up till then, he was a misplaced warrior struggling for a good fit. Which brings me to Trent. I don't really buy all this sudden lack of vision. I rewatch a lot of Bama games in the off-season and there was nothing wrong with his timing and vision and often broke off some big runs by changing the hole he hit. Something more personal with the guy is more likely the reason for the big change. Don't know what, but sometimes you just don't want it as much, for whatever reasons.
I think out DBs have shown out well in the NFL. Still wouldn't surprise me if Landon Collins hits superstar level before he's done. Ha Ha, Dre, Kareem still going strong. Humphrey got a lot of notice last season as a rookie and he too could have a big year.