Do not be so sure. If his father really was the Luo tribesman claimed, it is not unlikely that he would have. Don't the Luo speak the language developed by the Arab slave-traders, to communicate with their native allies in East Africa?
Check it out!
William Flax
Thousands of blacks in this country owned slaves. Some were even slave breeders, something whites wouldn’t do. The first freed slave in this country got a court order to turn his indentured servant into a slave and later went on to own many slaves.