I swear i remember reading somewhere that Rasputin murdered millions of humans for something in the grimoire cards. I'll try and find it again, but if i'm correct, i doubt he's a good guy. I am skeptical about the traveler and speaker though. There is also information floating around about Osiris. A warlock who was exiled for investigating the vex. I believe it was he who also killed himself frequently because upon death he would see flashes of his former life; memories blocked upon becoming a guardian. It makes me skeptical when the people investigating our enemies, and working to understand the past are labeled as traitors and exiled. Edit: the speaker also makes a comment along the lines of "those who hide in plain sight have their own agenda". Seeing as he is the only person, as yet revealed, who hides[behind a mask] in plain sight, i don't really trust him. He also seems to have knowledge of the nine; a group who seem extremely familiar and comfortable with darkness, even creating people out of darkness(Xür).