So if you've completed the game - is the Stranger from the future? Two things leading me to hypothesize this. First, the description of the gun she gives you says some parts of it should not exist (ie it hasn't been invented yet). Two, she says you must choose even if you choose wrong. This makes me feel as though she already knows what happens and is trying to aid you as much as she can along your "destiny."
If she means this, what is the wrong choice? Trusting the Speaker? Awakening Rasputin? Following the Traveler? Who knows, but so far this the only interesting aspect of the story for me. (Sorry if this theory is old news, don't get to spend a lot of time on here nowadays).
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#Destiny
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I was toying with the idea that the stranger is a vessel for the Traveller. Hard to get behind this 100% as we don't even know if the Traveller is self-aware or what the deal is there. If so, then the Traveller knowing its enemy more than anyone else, uses this vessel to seek out and groom a champion.