Some folk might not like D, but get rid of them and the last 25 years of rap history changes significantly and not in any particularly good way that I see. Even if you don't like Kanye or Eminiem personally they collaborated too much with too many huge influences in a remarkable way and helped define a generation, and that's before you even add on Gucci's influence.
Get rid of C and you lose a few decent songs. And that's it. Nothing interesting in the genre is lost, no big cultural moments go away, and you might even get more space out there to actually have something interesting hapepn.