King of the Delta Blues Singers?

The first time I knew of Robert Johnson was from the cover of Bringing It All Back Home by Bob Dylan the picture on which showed several record sleeves one of which was King of the Delta Blues Singers. Being a big Dylan fan, I thought to investigate and went out and bought it. I put the needle onto track one side one and BAM! a revelation. This was something I had never heard before. The high tenor voice, the anguished lyrics the whine of the slide guitar. Man, this was something else! I was not alone in this. People such as Eric Clapton, Mick Jagger, Keef and a host of others had also had the same revelation.
Clapton, of course, went on to perform many Johnson songs as did the Stones. None of them did justice to the, however. How could they? White middle class English boys had no idea of what the blues was really about.
Johnson's songs have been analysed and pulled apart ever since the first of his albums was issued. There have been many books about him and millions of words written. The influence on popular music of an uneducated black man who died at the age of 27 in 1938 cannot be overestimated. If he were alive today he wouldn't be able to imagine the power he has had on rock and other music. I would imagine that no one who reads this blog would not have heard of him. If not, why not?
As to the title of King of the Delta Blues Singers, this may not be correct either Son House or Charley Patton probably deserve that honour but even so, he is  a contender.