The purest Khoisan are 9% Cushitic [New Study]

[Lord Flacko]

Cushites originate in Ethiopia proper so there was no migration into Ethiopia. Those maps show that the peoples of Ethiopia have anceient lineages where southern cushites or protocushites migrated out of Ethiopia and into Southern Africa. But there was no back migration as you are trying to push. E1B1B also originated in Ethiopia but at a much later date than haplogroup A. Haplogroup A migrated into Southern Africa at an unspecified time frame as it could have been newer waves of mixed cushites from the Great Lakes area. The reason why the San have Euroasian DNA can be explained by the fact the Eurasian DNA has been in the Horn for over 10k years but maybe also from the European settlers themselves.

You seem completely lost. Reread my post if it helps and look at the maps and pictures I added.