Well...
How long did the list take? And why are Black Moon below PRT (genuine questions, not rhetorical)?
Without Poor Righteous Teachers ever coming out, there would NEVER have been a Black Moon. PRT was one of the first crews to infuse Reggae with 5% lessons and they often produced their own material (along with Tony D.). They also made some of the best albums of any Hip Hop era ("Holy Intellect", "Pure Poverty", "Black Business" and "New World Order") during their run. PRT's influence was heavy on many up and coming crews, one being Black Moon and also Smif N' Wessun and Heltah Skeltah.
Black Moon also broke up and got back together a few times after S Ft. went to jail and they broke away from Nervous Records. Had The Beatminerz and Duck Down never had a falling out and Black Moon recorded their albums without the long pause they could've been higher up. PRT dominated their era (which was slighty more competitive) and the were a direct influence on Black Moon so there's your answer.
One.