Ummmm, Jethro Burns. Now THERE was a picker!
I've been thinking about this lately and I think there's a problem in only naming "famous" guitarists. I'm more convinced than ever that the MOST VERSATILE person is a virtually unknown sideman. Someone capable of playing many styles really well. My final vote goes to Canada's Tony Quarrington. I can't think of any piece in any style that he wouldn't be able to replicate with a few minutes practice. He's not famous, but has played on hundreds of recordings. Among the famous....I'll still go with Danny Gatton.