Byf had a whole video on it, it's very interesting honestly. [url=https://youtu.be/NCJamUOoaGE[/url]
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Theirs no explanation for it being their at all. Just theories from lore people and bungie blind followers.
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I'm under the speculation of him taking off after the repair then fallen causing him to crash land and then letting himself be captured in the absence of a present Kell to declare himself Kell. Though this is all from foil hats, I'd love to see mom (Mara Sov) come back as the ruler of the fallen as a whole since most houses are now gone. I feel one of the two will be Kell or at least unite with fallen in the next dlc.