This is a good summary of the new paradigm I began to absorb about six years ago.
Genes don't do what people think they do. They don't work the way they think they work. They are more like holograms than you would be willing to believe.
They don't blend like paints. They don't mix necessarily when crossed. As plant growers will tell you, they often seem to be quite stubborn about their inherent nature to the point where you can never say for certain you have hybridised anything perfectly. Given their own lead, they tend to revert back to what they really are. A thing seems to insist on being that thing, almost as if its original record is the most important to it. This blows a mile wide hole in neo-darwinist evolutionary ideas.
If any of my ideas is really difficult to accept it is the notion that after the Neanderthal people were mass genocided, cannibalised, taken as war captives and gang-raped for thousands of years and the children made into chattel slaves … that the essential Neanderthal nature remains largely untouched. Given half a chance and the right climate, I believe that the current "hybrids" would simply revert back to Neanderthals. Without the constant beatdown of Sapiens and Melonheads and their boots to their throats, the Neanderthal would just wander off, form smaller extremely successful tribes of xenophobic elitists and once again dominate the planet through sheer attrition.
Something of the frustration about the immortality of the Enkidu comes through in Humbaba's Curse in The Epic of Gilgamesh. It is almost as if the "gods" have given up on the notion this creature could ever be destroyed so they have resolved to make it suffer as horrible an existence as is possible. In some ways, the curse is a white flag of surrender, conceding the Neanderthal is, was and will forever be. Apparently whoever originally authored this story was well aware you just can't keep the rodeo clown down because there is something about him that is innately magical. No matter how many times he gets thrown off the bull and butted, he has a way of returning on you. This is why I say, the Neanderthal must have friends in high places. Whoever created them decided that they would never perish, no matter what happened. They are the originals and the best and there is no substitution.
It is not magical, however. There is a very simple explanation for it. The Neanderthal is the best adapted biped for long term inhabitation of this planet. They are not designed for a week or ten years or just to survive the Holocene or to last for a single summer like grasshoppers. They are designed to last forever on a planet like the one we live on. Forever.