I was not sure exactly which William Deaver it was, but thought he might be one of the son of one of the three brothers, Richard, Nathan and William who had settled in Haywood/Buncombe counties in early times. I spend quite a bit of time researching these brothers, while searching for my ancestor, Charles Dever. I visited the Early Grove cemetery in the early 1980's and had difficulty finding it, also. My great grandmother was born in Giles county, Tennessee but moved with her parents, Neal Charles and Matilda Birdwell Dever, to Tippah/Benton Counties, Mississippi. This made me think, even more, that there was a connection. However the two lines do not connect till much farther back in their lineages.
I have a very good picture of the tombstone of Neal Charles Dever if you are adding additional pictures to your web site. After his death, his wife, Matilda moved to Texas and is buried there.