I think he was also really creating music for records - I mean with Patton you get the feeling that these discs just captured something that was there already - sort of a snap shot of a larger reality, but with Johnson you get a sense that he had the three minutes all worked out and that the drama was totally contrived (not a criticism). At the end of Malted Milk, when he sings “.. the hair rising on my head” - it actually makes the hair rise on my head (although I have none to speak of). Even that photo of him with the cigarette seems to indicate that he was totally aware, after the fact (the few years he has on the older guys is crucial), of this myth of the ‘Mississippi Bluesman’ as some kind of existential wanderer... maybe he wasnt but it sure looks like it to us now, and the fact that he never grew old means that younger listeners today never have the image 'spoiled' by seeing him on stage in footage from the sixties as an old man. In fact, all the other legendary Mississippi bluesmen, are, in the subconcious maybe, older men - even Patton, though he died was already older - or had something of the ‘lived’ about him...
Johnson is a convenient stepping stone for modern listeners, because he was in some ways a few years behind, and therefore stands in relief against the background of mid-late 30’s Chicago blues singers like Bumble Bee Slim, Bill Gaither, Joe Pullum etc... so people tracing a line back through Muddy Waters to Mississippi or ‘country’ blues can avoid ‘urban’ blues by going directly through Johnson and then back to Son House, Patton etc...