"So you are seriously suggesting that the people you list above could have been heard in New Orleans in 1911 ????" Of course not.

"When did you write the rules of what is and isn't blues and how it should be played?" We can all give good-faith working definitions of blues music when we have good-faith discussions. Our good-faith working definitions of blues music don't have to be identical to each other's for us to talk about what the music was like during different eras.