See the link above and scroll down. The conversation is between Osiris and Saint-14.
It's always been an idea back in D1 that when Oryx died something would take on that power and even further possible that multiple entities would try for it, but this is the first time we are referring to it from Bungie's side of things.
What do you all think? Is it possible we have not one, but two taken kings in a potential D3 showdown? Or is it possible too that Savathun herself and not quora are the ones "taking" alongside Xivu Arath in a split of that power?
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I think he means taken kings in a sense of referring to oryx without saying his name. It may be Osiris’s informal and also slightly humorous way of saying that I think you’re looking too deep into it. Also: remember, oryx got his taken power from a big worm. Maybe that worm used Echoes too.