This is an insane theory-- I love it, the idea and the concept of superior beings possessing the forces of darkness we currently know of, captivating them, and commanding them to take Earth. We haven't faced the real threat yet. Who knows, I think we'll learn something new from The Dark Below in the new strike when the Dark Heart beats again, resurrecting the Black Garden. Think this god-like Dark Heart creature is a creation of this "smoke" race, which is why the Vex praised it as a higher being?