There actually were thousands of black slave owners. I’ve read there were more than 3,000 in New Orleans. In Charleston, and maybe other places, there were owners of large plantations who were black and rich enough to have the preferred seats in the churches. And don’t forget about the Indians. They were slave owners too.
I’d forgotten the Indians. I recall now reading a story about one of the deadliest steam ship / paddle board boats accidents in US history. The main boiler exploded right under the smoking deck and supposedly some men flew 100+ feet in the air (women not allowed to smoke there). Many ship slaves were killed as well.
The vessel was Indian owned, Iroquois maybe…?