Eddie Daugherty (1892-19??)

Ray, Edna, and Stella are my known grandparents, plus a shadowy figure known to me as 'Ed W Daugherty'.
An image here is expected once I've tracked him down.
    Could literally be a missing link with a common ancestor between him or Stella and Ray or Edna, there's some 23andMe info to support that.    

The 1920 census shows an "Ed W Daugherty"
Actual name is 'William Edward Daugherty' (1879-1945), wife 'Sterling Stella Boyer' (1879-1961)
Daugherty is a very common name in the region so it's just a start since it's the right area, Morgan Co.
Him actually being white and married to someone else would fit the mystery.