Remember what our discussion is about. We are talking about the South, not CSA states. No Partisan. We are talking about the civil war. You have alleged that the confederacy had heavily divided loyalties with strong unionist portions in their population. Yet to reach these numbers, you insist on including states that were either disputed or not at all in the confederacy. You can't have it both ways, Partisan.
Once again, an authority on this subject is Lincoln's Loyalists, by Richard M. Current.
And once again, a stronger authority on this subject is the official records of the US government. Those records say that there were not even 200,000 blacks in the entire yankee forces, let alone from the south. Those records also say that at least 80,000 of those blacks came from union states and at least 50,000 of them were from the deep north, as in places like Massachusetts and Pennsylvania and New York. Live with it.
First off, there was no such thing as "yankee forces" -- they were the United States Army and United States Navy. Disparagement of the U.S. military is what enemies of our country do.
In discussing whether blacks in rebellious states were loyal to the United States Government or to the Confederacy, the relevant number is that of blacks from CSA states who fought for the United States Government versus the pathetic handful (if that) of southern blacks stupid enough to have fought for their slavemasters. And slave and conscripted "free" blacks working as ditch diggers and teamsters do not count. In discussing the loyalty of the overall southern populace, then the relevant number is that of the blacks from all southern states who fought for the United States Government. And so on.