Killing Cayde established stakes.
Since then, no one had stayed dead. Savathun, Eramis, Osiris, Crow anyone and everyone in between.
In the final cutscene of the season, Elsie says to Anna look as a glow that seems reminiscent of a Ghost Revival lights the room.
If Ana gets her self programmed boyfriend back, then what is at stake here? Is this an epic sci-fi franchise or a soap opera?
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Rasputin met the requirements to become a Guardian. Theres a good chance he gets revived again. In addition he probably has a backup file of his memory saved/ stored somewhere allowing him to remember what he was.