Theory:
The Exo Stranger is some sort if manifestation of the Traveler.
Thoughts?
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im thinking more along the lines of an exo that has traveled back in time. look at the fluff on the gun she gives you. parts of this gun shouldent exist yet meaning from the future. she knows about the vex and everything else in detail so it makes sense she could be from the future thrown back in time by the vex or her own doing to stop them.