I can't help but wonder if, perhaps, the reason no one can remember the Warriors of Light from Cartenau might be a result of those individuals having become the Warriors of Darkness. If that's the case, maybe we'll even see the others from the trailers and cinematics. That, or perhaps the Warrior of Darkness is a Primal version of the Warrior of Light from Cartenau. People became so desperate that they were tricked into trying to bring back the Warriors of Light and ultimately created primals instead. Sounds like the Ascian MO.