That implies to me, that Denisovians and Humans are distinct species, and can be told apart by some DNA testing. You can tell apart almost any two groups of mo

That implies to me, that Denisovians and Humans are distinct species, and can be told apart by some DNA testing. You can tell apart almost any two groups of modern humans with DNA testing. You can tell apart paternal twins with DNA testing, that doesn't make them two different species. Are those sequences ever found in modern humans? Yes. Could they be? Yes. What would that human who had more Denisovian DNA than typical be called? Well today Neanderthal DNA in humans can range from almost nothing to as much as if your great grand father was pure Neanderthal. What do we call either extreme? Human.