Being an ex-Confederate soldier in the South did not give you automatic hero status or recognition, always to be remembered and memorialized. Nobody in my family knew about my families involvement in the Civil War until I did the research. Had I not, nobody would have done it. Appathy in the family history in the South became epidemic during the 1950s and continued strong until the 1980s. It is just in the last two decades or so that it became popular with the ease of computer research.
Confedererate Black soldiers were remembered for their service while they were alive, this is documented and unfortunately forgotten under the works of Northern publishers and Movie makers of the 20th Century.
I cannot agree with your numbers, because I do not know the source of research, but according to archived documents I've studied, the numbers I believe are more between 10,000 to 20,000 spread across eleven states. These men's service exisited, and the number of source references are countless.