Interesting link. But I don’t think it even brings up the number of blacks who owned slaves.
The third link in my reply to you has census info and stats showing the percentage of blacks who owned slaves.
Read it. I think it might interest you.
I had already read your third link. It doesn’t support the notion of large numbers of free blacks being large slaveowners.
Most who owned slaves probably did so because when he bought his wife out of slavery if he freed her she would have to immediately leave the state, as newly freed slaves were not allowed to stay. This might mean, for instance, that they would have to leave children still in slavery and certainly other family members.
I’m not sure how this article supports your position that slavery was purely and only an economic institution, with no tinge of racism to it. Blacks no doubt participated, but that doesn’t change the fact that the institution itself was based on the idea that blacks were “natural slaves,” as white southerners of the time proclaimed loudly and frequently.
You will also notice the absolute absence of white slaves in this period, which seems a little odd if race had nothing to do with it.