tarik you sound unteachable. Very bad mannered and rebellious.
Take it or leave it. I will throw knowledge I know. South Sudanese, Denka and Nuer are members of the Nilotic race. Not Bantus or Cush, formerly Hamites.
The Kush Kingdom around Merowe or Napata or both was where King Kush ruled. What ethnicity was the people of Kush Kingdom. They were Nioltic as still are the Nubians to the north. To the west were the Belemys(Romans called them so), now the Bejas. The Bejas are the most ancients among the Cushitic groups, older than Afar and Oromo. The people of Gedaref and ketsela are Bejas.
Up until the 1970s, Kush or Cush was known as only the King Kush, the name of a king whose kingdom was also known as Kush kingdom, rich with gold, was invaded and attacked by King Ezana for the plunder of Byzantine Empire or Eastern Roman Empire.
I can explain more if u have questions.