My theory Voyager probe landed on fallen home world when the traveler first arrived. Traveler had access to human DNA. As did the fallen. Traveler understood the messages. Location in space. So the Traveler planned to go to us next. But the hive having new advanced technology decided to try and clone us, but because of decay from age. They used parts of their own DNA to clone us creating the Hive explaining why we are so similar to the hive, and the grim. card about Toland saying he spoke with the wizard and it said we are the same. The first of the hive born from this became the top hive after making contact with the darkness. Which I think is force that corrupts further. Because our DNA was twisted and corrupted, by the fallen mistakenly, they gained more power. The hive quickly over ran the fallen. It would also expain why the Fallen and Cabal don't try to befriend us we are extremely geneticly similar to the hive. That is also the reason the traveler abandoned the fallen early because it knew from the data on the probe that we would be one of the only ones able to stop the hive. I have more but I'm tired and I don't think I'm making as much sense as I think I am.