The dude won the Butkus Award. That's a feat unto itself. As far as him being "dumb as a rock," I think you're being harsh and failing to appreciate the fact that some people just learn differently. What did Saban say about Foster?
"If you put on the film he'll be able to tell you chapter and verse because that's how he learned it."
Saban also says he'd like to see Foster in a good network where he can learn and be mentored.
As for Luke, I wasn't the one making the comparison. The kid won the award by himself.