You can make that argument, sure. That's your opinion. But there's technical ability and several other factors we could consider here, and hip-hop culture doesn't belong to black people, so I can argue just as well that his impact on black culture doesn't make him the best rapper.
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Lol. You know who made hip hop accessible to more than just black people? Eminem.
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You've now disqualified yourself from this whole conversation. Hip-hop culture has always been multicultural. Since before day 1. The first writer to go all-city in New York, graffiti Mecca, was Taki183, a Greek kid. Go rent Style Wars for the first time ever, that will be a good start for your education.