For all we know, it may have been John Renick's grave marker, and that alone.
In terms of professional research, when faced with a choice of exchanging money for information, interest tends to wane rather quickly. Some folks would rather buy a case of Mountain Dews.
A few years ago I discovered that a co-worker's ancestor served with mine in the "Tuscaloosa Rifles" during the WBTS. When I shared this bit of info with him, he replied that he already knew more than he wanted to know about his family. Nothing personal -- that's just how he fells about that topic. George has since retired but still drops in to visit me from time to time.