Another Theory regarding the Exo Stranger is that she has tracked back and forth in the timeline trying to stop the darkness. (By the Exo Stranger on Venus) "I have stood here before in this spot.... Sometimes I see myself among the Dead". (Also not 100% about this: "The people are not always the same" or something talking about events). And how the opening sequence has the three astronauts on Mars, the mountain range changes three times, the position of the three astronauts also slightly change. This could be evidence that the Stranger is trying to find a timeline where Humanity survives, and has previously found promise in our guardians particular set of events. This is something else: a Grimore card states about Exo Dreams. "There is a tower, not this tower, but a tower. It always starts with just me, but people come. I fight them. At first with fists but I pick up weapons as I go on. The Army is filled with people I know, people I have meet. And some I haven't, but I kill them the same. This could be what the Stranger talks about when she says "I sometimes see myself among the dead".