I don't have any sources for support but my feeling was that Monroe got over his resentment after Ralph Rinzler helped him understand that he was the fountainhead of a whole genre and nearly every significant band had at least one member who'd been a Blue Grass Boy and learned at Bill's knee. It would really piss you off to have assembled a band of the quality and innovation of the 1946 Blue Grass Boys and then have key members leave and eventually become competitors.

Bill and Lester used to perform together in the 70s when they started doing those "History of Bluegrass" concerts at festivals. Half the people who ever played with Bill would be booked at the same festival and they used to recreate some of the old numbers. I don't remember Earl being part of that though.

I think Lester's falling out with Earl was at least partly because he just didn't like the music they were doing so they could seem like part of the folk revival. I think he loved the music they did in the 50s and just hated all that "hippie" stuff.

      - Mark