GUYS THE STRANGER IS
ANA BRAY Ana used to be a guardian of the golden age and her family is house bray, house bray were the founders of the clorvis bray corporation which made humans into exos including cayde-6, after the collapse most exos lost most of their memories even cayde admits that he doesn't remember everything from that time (I'm getting this from destiny pedia btw)
Ana was alive at the time of the collapse but it is unknown if she was revived by her ghost or is even still alive
Ana could have been an freshly turned exo by her family who are the founders of the company that makes them
The reason "the stranger" called the ghosts little light was maybe because her ghost revived her as it's last action and because the ghost was now dead it couldn't tell her about things like the ghost traveler and stuff (we know that a guardian can survive without a ghost but not revived)
I think I got the jist of my theory but I may have put it way out of order
English
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OH AND YOU FIND ANA's ARM BAND WHEN GOING FOR THE NO TIME TO EXPLAIN EXOTIC RIFLE
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Sorry to burst your bubble but ana bray was a golden gun hunter so she was a gaurdian. The exo stranger was not forged in light as she says on the venus mission