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Is this Koombeya Science?
This are the facts
Nubians are the only Nilo-Saharan speaking group that does not cluster with groups of the same linguistic affiliation, but with Sudanese Afro-Asiatic speaking groups (Arabs and Cushitic Beja) and Afro-Asiatic Ethiopians.
Y-chromosome and mitochondrial DNA studies reported Nubians to be more similar to Egyptians and Ethiopians than to other Nilo-Saharan populations.
Look at K=10
http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1006976
The Beja have a large chunk of the Cushitic cluster, while Nubians carry a lot more Nilotic DNA.
Also, in the Beja the admixture is dated to over 3,000 years ago. They are far more ancient.
Nubians are much more recent people.