Oh yes, you've seen this. The Warminds are to powerful/smart. Also there is a theory that Rasputin actually traveled back in time a million years after the collapse. The collapse was actually caused by an evil us the humans. Rasputin travels back in time after a million years of loneliness and thinking to try and save humanity. The catch is that Rasputin is the traveler, and every time he try's to save humanity he brings the darkness which is war because it's all he knows, he is a warmind. He continues to destroy us and comeback in time to saves in an infinite loop but his time with the knowledge he got from the black garden, he breaks himself apart into ghosts as an attempt to resurrect mankind. The speaker, The Queen, and The Vanguard know the truth. Xur is from the "outer world" which he quotes so much. One of his most important lines is "where I come from there are no birds only shadows". And "your traveler has a dark shadow". This probably would be another war mind who doesn't like its creators. (Speculation what really is the darkness)