I don't know if anyone's thought of this before, but it came into my mind yesterday, so here it is.
What if the first humans on Roshar were actually refugee's from Scadrial, that came after the Lord Ruler made changes to their world.
I remember somewhere in the book it said that the first human's previous world was destroyed by Surgebinding, but maybe it was the Lord Ruler's changes that he made that caused them to think their world was destroyed.
Any thoughts?