Not everyone is going to memorize all 20 All-Americans on Alabama's roster. Seriously, a lot of us don't pay all that much attention to other schools to remember a player from a few years ago. I did remember that Mark Barron was a DB (wasn't positive his position was DB though) that used to play for Bama. But that's about all I remember about him.
I didn't know who he was more because I could care less about who plays for Bama. I also don't follow the NFL draft. The only people I could tell you in recent years that played for them is Richardson, Lacy, Yeldon, Jones, McCarron, and Ingram.