From what little I know about Dylan, he made it his business to know everything about anyone in folk music. He studied it like a college textbook. Of course he would have known about the Ramblers and Mike Seeger as well as everyone else. I also know that Dylan's statements may not be totally unfictional too as in the early days where he wanted to "mislead" the press for a joke. (caveat here)

What did Bob Dylan know and when did he know it? That's the topic for a biography that has yet to be written.

Frank