Exactly We know that bungi liked darksolse and where playing a lot of datk souls 2 when making the game Maybe they took an idea from darksoulses lore and didnt add people. Think about it, there was a colapse there cant posible be a full account of everything that ever happened because moste of that must have been destroyed. They also had verry little recording technology so they couldnt have exact records of the early city. Hopefully the exo stranger stays a mystery or they incorperate a dlc where she tells you. Like in dark souls Gwens firstborne.