You point that body servants, teamsters and cooks and others in non-armed services ran the risk of being killed, wounded and captured is well taken. For example, we know that some of them were captured and died in Federal military prisons. No argument on that point, either.
Just to be clear, the debate concerns the existence of black or FMoC armed military units within the Confederate army. That was Dr. Levine's focus, and mine as well. If that wasn't urged upon us as being factual, we probably wouldn't be discussing this for so long.