Thanks for this post. Levine does a better job out of providing quotes from Confederate leaders and military officers than I have. He simply cites Confederate leaders on the topic from the start of the war to the end. I will add that Burke Davis, To Appomattox: Nine April Days, 1865 includes an account of a recently raised black Confederate company that made a brief defense of a Confederate supply train during the retreat.
It's curious that supporters of the Black Confederate myth routinely reject statements on the subject by Confederate officers in favor of remarks by noted abolitionists like Frederick Douglas and Horace Greeley. Apparently Confederate leaders have nothing to say on the topic that they wish to consider or have repeated. If anyone knows of a similar case in which advocates of the Southern cause gladly accept the word of Yankee civilians over that of Confederate officers and political leaders, I'd like to hear about it.