I have a theory that the Traveler is Evil to backup my theory, The Darkness follows the Traveler where ever it goes, also I think the Traveler is a Beacon for the Darkness.
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What is your theory? I too have considered this, but in a different form, this darkness is not a true being but a byproduct of the vex and their god, IT is the embodied form of change and those that can't adapted are wiped from existence. The traveler brings the golden age, look at the 1920's, great profit is always followed great loss so the darkness is the shadow, no pun intended, of the traveler. The vex are also a byproduct of the traveler in that they are great technology, the traveler's golden age in one of the civilizations developed the vex, but with their time traveling ability, they changed they're creation to long in the past to stop destruction of their factories.