Interesting point since not all slave owners in the US were big plantation owners, slaves were owned by anyone who had the price. No doubt to me that Mr. Metoyer at some point won his "freedom" formally as a black and this former slave, well, purchased slaves. No doubt back in those times without modern machinery's and gadgets that getting the work done around your place it was necessary to engage a lot of workers. Slavery at the time was the custom until after the Civil War with no slaves, those enslaved once now how to be paid wages as freemen. Can history tell us Mr. Metoyer's "back" story? It is true that one does not think of slave ownerships by blacks. Many blacks were given papers of freedoms after masters died. So there were  "free" blacks" in the slave states, which I think for the obvious reasons could be problematic to them. I don't know what your point is do you? My point is that slavery is a practice for humane reasons had to end no matter who owned the slaves.