Brother Chris...I agree with you that the badge on his chest could be the KGC emblem. It appears to be the arms of a cross with some ornate design on the ends (like the trefoil on the Maryland flag) with the shaft extending down to a flaired base. Like the serifs on a capital "I". The image is so low resolution that you can't do much with it in Photoshop. I'm going to continue doing some searching myself. The Civil War Lodge of Research No. 1865 here in Virginia has a good database of Masons in Confederate service. The site has a strange URL but you can google it and find it. Good hunting.

Keith

Henrico Union Lodge, No.130
Sandston, VA
Est. in 1855