In your second post, what do you mean by "the foundation of the culture"?
Hip hop and rap emerged as expression of social struggle. Throughout its entire history the musical culture has been periodically tainted by con artists and cleansed by true musicians; the former of whom typically seek to capitalize on the popularity of the latter, and then inevitably dilute the substance of the culture itself (at least in the sense of the word 'culture', as I believe you are using it) when there is an influx of money-seeking, cookie-cutter, rappers.
I don't think mainstream rappers select their names on the basis of anything other than what will sell. For example, Whiz Khalifa, Kid Cudi, Tyler the Creator, all have names that are, more or less, catchy, but they do not suggest anything about their music.
Hip Hop is a human creation, and like all human creations, it will always evolve and move in new directions. Musicians seeking to create music that is true to the original intent of the 'culture' must incorporate contemporary (and today, more far-reaching) social challenges in their music.
Here are a couple of examples of such musicians from different periods of hip hop's history
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These guys have the right idea, but I think its still a little too early to tell where they stand as far as legitimacy goes.
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So, yes. Hip hop today needs more musicians with legitimate concerns for the well-being of society.