I don't believe you're going to get a reasonable answer because there is none. Personally one of the truly strange features of "Black Confederate" testimonies is that so many of them are based on Federal observations. For example, a Northern report of black regiments being raised near Yorktown in the winter of 1861-62. You have to ask, when did the Yankees become such keen observers of Confederate commands, and why are their accounts accepted so uncritically by some folks?