What if at the end of festival of the lost we investigate the murder of another member of the Shadows of Yor, we know there are more out there, and with the drifter's return and come out of hiding this could have sparked another to come out of hiding. This could also be the setup for Joker's Wild, where Drifter may even be killing Shin after he has killed so many of these guardians. Let's be real here, Shin malfur is just as bad as the Shadows, he killed their leader, then hunts them down relentlessly, whats the point, its just pointless vengeance. I Also think that the Drifter is taking a page out of Savathun's book and is using the gambit as a battery, motes are called motes of darkness, yet they are white, the lore describes the void as a perfect balance, maybe the drifter is a guardian that uses void subclass and by mixing the light, from the motes and the taken energy he is actually accumulating void energy that he will use to annihilate shin malfur