In regards to someone who has first hand knowledge about Black Confederates:
I would recommend the following posts:
A Primary Source . . . "I spoke at length with Mr. Winbush about his ancestor and his memories. Louis Napolean Nelson served as a private in Company M, 7th Tennessee Cavalry of the Confederate Army. Private Nelson was a slave. He began his military service as a cook, a soldier, and ended his service as a chaplain."
And . . . a brief follow up here.
By the way, I believe Mr. Winbush is MORE than "sophisticated enough" to comment on his own heritage and offer a unique and worthy perspective.