Smitty Belafonte
All Star
Kept it alive and destroyed it all in one.
He didn't say Cash Money.. He said the South..
The south took hip-hop over for a long time. I don't know about keeping it alive. It wasn't dying. But they were the kings of it for a long damn time.
The East Coast will always get the most shine cause it was created over there. They had the longest reign from inception to about NWA.. Then Biggie/Wu and others brought it back.. They held it again to around the 2000s before the South took that shyt over. I'd say it's way more global now and anybody can be on top.
But at the end of the day, the east coast rappers are seen as the pioneers and most of the labels and publications are on the upper east. And, like you said, every era still had an east coast rapper going multi, so they was always right there. They'll always get the bias