I created a post about the Kings and why I believe they are, by far, the most powerful Fallen House. It was called "House of Kings pulling the Strings?" I can't link it for whatever reason, but if you can find it, it's in the Lore forum somewhere.
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https://www.bungie.net/en/Forum/Post/209364248/0/0 There's the link! I really find it fascinating how Bungie has subtlety showed us that the Kings have attempted to control all the other houses, and I hope their patience is rewarded in the end, with a major focus later on.