She got up this mornin', come-a-tippin' 'cross the floor. Said mama, in her lovin' stockin' feet: "Honey, fare thee, Papa fare the well. I done all in the world I could trying to get along with you - Blind Lemon Jefferson, Stocking Feet Blues
Surely it's Josh White, nobody played in vestapol or bent the low strings like that. He's got such a distinct sound as well and recorded Good Gal for himself.
I'm surprised that if "Good Gal" was recorded at the same session that DGR had any doubt at all about who the guitarist was. The fact that they did illustrates my problem with that reference: too much reliance on session notes and not enough on ears.
The problem with "ears" is that they are subjective. The tracks we are now discussing are relatively clear-cut, so "ears" are reasonably safe. But many other "unknowns" are not so clear-cut, and postulating on aural evidence only has led to all sorts of arguments. So DGR's compilers have opted to take a conservative line and pin their faith primarily on those session notes. That policy is explained more fully in the book's introduction (on page -x-). One might not agree with it, but that's how they do it.