Murray, going back to your original posting, if your looking for a term to describe the type of music that the country blues artists that you mentioned played, Grossman put together a great collection of arrangements by those artists called RAGTIME BLUES GUITAR (it also included himself Willie McTell, Bill Broonzy). I worked my way through it years ago and it's still paying dividends.
As for Stefan's playing I have to agree with many of the opinions here. He's done an awful lot for fingerpickers like me but I find most of his playing kind of stiff and almost didatic, like he's demonstrating rather than actually performing. There are some notable exceptions though like Bermuda Triangle Exit off his first collaboration with John Renbourn, which is beautifully rendered. Of course I generally find solo guitar a lot more fun to play than to listen to.