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Nilotic languages were adopted after their take over of Group C culture, but it was elite dominance of the genetically Cushitic like population but the bulk of the population were Horner like. You are right, their elite was Niolic like, that is was why there was linguistic shift from an Afro-Asiatic language like Cushitic or Egyptian to Nubian. But their ancestry is mostly from Group A and C culture. Before the establishment of the Kerma culture, there was an extra influx from the Mediterranean Levantine Neolithic population in North Sudan but there was massive massacre by a incoming Niolitic group from Eastern Sudan.
The Greeks of the Ptolemaic era described Nubians almost like how Europeans described Somali and Abyssinian peoples phenotype and how they different from convention "Africans" . The Ancient Nubians most likely looked like the old poster "Wadaad", in other words they were wadaadiods ;P. Christian Nubian frescos and painting look no different from Christian Habesha religious paintings
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