ok guest i havent looked at the three you mention, my comments were bsed upon colours.and the impression he gives in the interview
Maybelle was taught it by lesley riddle, and it s a banjo style, one used by roscoe holcomb, tune is played by thumb. maybelle occasionally used another style, but she is genarlly associated with thumb melody,plus the bump ditty of frailing
Donovan turned up at a festival i organised he appeared modest pleasant and unassuming