And Rihanna doesn't have a "badgirl" image when her name is still recognized as badgalriri and her breakthrough album was Good Girl Gone Bad?
The 3 top black girls in music know what's up. Come to the video set/photo shoot exposing ass cheeks, thighs, and a side of clitoris or we're not playing your mess. But such is also the case for other women in music.
I wouldn't minimalize Top 40 rejection to just "black coo singers/dancers." It's any female that isn't slutty/high/naked.