I'm very skeptical that Leadbelly learned Gallis Pole from Hays/Guthrie et al. There are a gazillion old English songs floating around the American South. He could easily have picked up a version in Texas or Louisiana or such parts long before the Lomaxes brought him to New York. He seems to have been a veritable song magnet. Damn' good one, too.

Alex
O..O
=o=