Eric, Virgil Roberts has researched that and hopefully he will see this and confirm it for you. He and I did visit the cemetery and while I can't recall the grave number and section he did relay the info to the appropriate folks that Mathew Andrew Dunn is the man you show listed as J.A. Dunn.

I haven't tied it together yet with census records etc but I believe my great-grandfather's first wife, Nancy Dunn, was a cousin to Mathew A. Dunn.