"Ya'll still surprised when niggas who rap real good turn out to be dumb"
There are multple intelligences, and I'm sure some of these lyrical miracle rappers might even score highly on an iq test, but these cats are largely uneducated. Not just formal education either. They have not read books on a broad range of topics and discussed those books with people who understood them. And when they do read, they often lack the ability to discern credible sources.