I think its very inaccurate to say everyone knows or would know who Paul C was. For one he died when he was 24. Two rap is not what it is now what is was then, at all. There would have been no reason, with exception for , beat heads (small community), aspiring or people already involved in music to be concerned about album credits. 90% of these people would have had to be in Nyc. The rap world and communication was not even US wide like that yet, this was strictly Ny rap were talking from what may have been a tri-stare circuit. You add that at the out of state populace purchasing all those albums, you are still forgetting that the demorgaphic was way smaller than todays, and todays is almost Producer centric. Even still, there was plenty of white Engineers/producers that preceeded the great brothers that can perform both of modern time. Isnt Bob Power white? Qtip was not originally a producer, like Eric B and Rakim he was a record nerd, and found samples, which he admits he used to at most loop through a tape deck. Lp said Qtip only started working on his own a little before Ilmatic. Naturally music inclined artists like Tip, Lp, even Dnice and Scott La before them learned the boards. Only in the mid 90s did signature group producers like Pete and Premiere start to work with other artists, which is what made they roll stand out.