I don't know if this has been mentioned yet or not. But I was reading one of the grimoire cards titled "Grimoire Card: Legends 2". This card seems too hint that "The Nine" are strongly connected too/are The Warminds. If anyone else has any other theories or ideas feel free to let me know in comments.
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They're the 9 dicks that savagely -blam!- your anus everytime you go see xur at the tower.