Talking rhythmically to a meter is actually a skill and a natural talent versus something you are born with (a vocal range).
Reinforcing what has already been stated....
Preface...I have respect for good rappers. 60 minutes did a segment on M&M years ago and it was real clear that he and people like him have a very real talent with words and a mind that can store them up and improvisationally flow them out in a coherent continuous stream on demand. Marco Rubio wishes he had that depth of talent.
But...When I used to take my songwriting hobby to studios, I found that the hardest people to get what I needed from were vocalists...so, to avoid the pain...I started learning to sing myself. I don't know what my range is but it is very limited. Working within those limitations and basically singing to pitch with a little bit of stylization has taken me years and is sadly still a hopelessly lacking work in progress.
Yet, I contend that I could have become proficient at talking to a meter after a one weekend seminar.
After a little practice and technique honing over a few months my life as a White rapper would all come down to natural timbre and having or not having the "it" factor. To that extent it seems a natural talent.
Admittedly, that's the view of an uncredentialed, unschooled (in music) , never paid his musical dues and don't intend to start....amateur hobbyist internet songwriting forum lurker. (though passionate
) But I think it's reasonably well founded and realistic.