Problem is with your theory, along with the 347 vested dynasty, the FoAF is not In the game. Confirmed by bungie
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What I wanna know is if it's not in game why does that 1 person have it already? It's in the game they just don't want to unlock it.
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its in the game because someone who was really messed up who could do anything but was doing therapy and healing through playing destiny to where it was in the news and bungie made him a gun and gave it to him.. hes the only 1 to get it and probably will be that way
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It's a hint to the strangers rifle because it says "IT SHOULD NOT EXIST YET" in the weapon summary!!!