My personal theory is the 9 are a group of Guardians WITHOUT their Ghosts who are the top tier of guardians and we have already met 1 member imo in the main story and she gives you the Rifle.
(The Strangers Rifle)
I also think it's very possible Eris is one of the 9 as well from her sneaky scene after the end of Taken King.
Very Illuminati-ish :)
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Rasputin is one for sure
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Изменено (BatchBoys2): 2/7/2017 2:21:49 AMCayde once said that his mentor called him Rasputin as a joke. Maybe the Stranger and Eris are Agents of the Nine
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Only thing is the Exo Stranger explicitly tells you she was "not forged in light", meaning she is no Guardian.