Why do black wrestlers don't make in the WWE sometimes?

I know Mark Henry and The rock had great careers but, what about the Shelton Benjamin, R-Truth, Cryme Tyme, etc. was it because they had horrible gimmicks, lack of charisma or they didn't for that WWE mold. Like Shelton was a great athlete but, in my eyes his mother gimmick was hurting him. But what are your... show more I know Mark Henry and The rock had great careers but, what about the Shelton Benjamin, R-Truth, Cryme Tyme, etc. was it because they had horrible gimmicks, lack of charisma or they didn't for that WWE mold. Like Shelton was a great athlete but, in my eyes his mother gimmick was hurting him. But what are your opinions I would like to know before I go to the WWE.
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