doesn't matter anymore. Stop speculating. Bungie says so.
[spoiler]that is until their revenue drops and they scramble together some half-assed bullshit out of desperation and disguise it as "an epic plot twist of which you'll have to buy the game/DLC to experience"[/spoiler]
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I'm ordering my Exo Stranger body pillow so Bungie can never take her away from me.