Sorry to see his passing but grunge was crap. He and Corbaine were not "geniuses" -- just early adopters.
It looks like they really bought into their pity-parties.
RIP.
I loved the stuff... That era produced some incredible work (along with a lot of garbage). We had Soundgarden, Stone Temple Pilots, Nirvana... a lot of unique stuff that really worked.
I don't think you could call it something completely NEW, but they definitely forged new sounds and style that just seemed to come together.
I'm not one to get into the social aspects of music. If you want to enjoy music, you have to ignore that part o fit as much as possible. I look at it strictly for the musical content. Hell, I think Roger Waters is one of the most ingenious men to ever live, writing pure magic... but I hate that sonofabitch in reality