He's one of our most useful allies. He's been helping for a while now. He should be counted as an honorary member of the Vanguard due to his skill and influence. The whole point of his "Gambit" was to prep for the arrival of the Black Fleet and the Witness. It's time we find out what exactly he has planned and make use of it. He should play a much larger role in the Narrative going forward as we didn't keep him around for his bedside manner. If I understand my Lore correctly he's a Titan with the mind of a Warlock and the agility of a Hunter. We need a Drifter centric story campaign.