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So, as I understand it, we have what is regarded as prominently sapiens DNA, plus some Neanderthal, plus some Denisovan, plus some DNA from an as yet unidentified fourth species that is as equally distinct from us, Neanderthals, and Denisovans as Sapiens, Neanderthals and Denisovans are from each other. Are we, or are we not technically hybrids? If we are hybrids, and another extant hominid exists, why would it be beyond reason that it could be a hominid? If it's simply because Ketchum came up with the theory but then discredited herself, I would point out by means of cliché that even a stopped clock is correct twice a day, unless it is a 24 hour clock, then it is correct only once.