The other 50% of Europeans can trace their DNA to an off-spring of the same fellow that was born a couple thousand years later and that they eventually made their way to Europe through the Middle East.
I read this in his book titled: Origins Of The British
There is an Indian anthropologist (N. Narain) who says that the European homeland is Gansu, China
I read THE book and He said we all originated from that pair in the Garden of Eden.
I’ll take His word over some scientist who has a bias and lack of credibility.
What about the 6 Eves?
Going back further, both those streams came out of Africa, according to track-back of Y-DNA mutations (passing from father to son).
It is necessary for the Younger Dryas to kill them off first.
Even the Chinese are reporting their own origins to the West in the Mongolian plateau above 700 meters (where it's dryer).
With few exceptions there are huge gaps in the record of human occupancy in China ~ but the yangtze and huang ho estuaries were populated mostly by major predators until relatively recent times.