Scientist discovered recently that Homosapiens were not the only humanoid species in West Eurasia. Europe was populated by Neanderthals and Homosapiens (Cro Magnon folks), West Asia was also populated by Neanderthals, Homosapiens and also some other ancient Caucasus species, while about only 20,000 years ago Denisovans populated Central Asian Steppes and they lived there together with the Neanderthals and Homosapiens. If hg. P*, R1*, R2* evolved in Central Asia then it's possible that it mixed with the Denisovans and that it contains some kind of non-Homosapien mutation.

According to me ancient hg. I* folks in Europe were hybrids of Neanderthals, Homosapiens and European hominids. Ancient hg. J* folks were hybrids of Neanderthals, Homosapiens and local Caucasus hominids, while ancient R* folks were hybrids of Neanderthals, Homosapiens AND Denisovans!