Alabama has more players drafted than most any other college so it's easy to pick out a list of guys who haven't turned into superstars at the next level. I think a lot of it has to do with how finely tuned Saban's football factory is, its BBesque. Cyrus Jones, Fluker, and on on you can add to that list.
Then we overlook guys like Ryan Kelly, Amari Cooper who come right in are as pro ready as can be and playing a pivotal position. In short, I think the Alabama player thing has some truth to it but it's very player specific. What type of injuries did they play through? Who were they surrounded by? How did they test at the combine? Same as any other school I suppose.