African dynasties existed from as early as 1200 b.c. to 1600 a.d. in all the countries of Africa. They had kings, queens, wealth. They won and lost wars like any other peoples.
Your 3 points above.-------- You are correct. But (With all due respect), you are omitting many other very critical factors & variables.
Clearly, black African kings, queens, doctors & other educated ones existed.
But, the black Africans who were the kings, queens, doctors & other educated ones were not African Americans ancestors.