In the “Legends Lost Weapon Quest,” you can be rewarded with the perfect paradox. My Name Is Byf made a video Saint-14, The Perfect Paradox(https://youtu.be/Ciy4WIKbTI4), he speaks about how we will one day experience time travel, his theory was that we will learn it through the Vex or maybe even the light its self. I believe that we will experience it through the Exo Stranger. The Strangers rifle says, “Ghost’s analysis suggests this weapon has been exposed to incredible forces…and that parts of it shouldn’t yet exist.” This hints towards the stanger being the way we will “give” the Perfect Paradox to saint-14 through time travel.
Just a little theory