There is a grimiore card (about Rasputin I think). It talks about the keeper of the garden fighting the darkness, and loosing. If this was one of the war minds maybe its the the stranger. The card refers to the keeper as "her".
This would explain her access to advanced tech. Her apparent dislike of the vex. And what she could be on the run from in the cut scene were she is talking to someone over the radio.
Discuss and submit theories!
Edit: the card is under ghost fragment mysteries. It never openly says Rasputin is the one speaking. But the person talks about having an immortal name. He also says he has brothers AND sisters
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#Destiny
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Warminds are not people, they are giant computer arrays. Did you not play the DLC where you see Rasputin, one of the warminds?