not the expression ( A ROLLING STONE GATHERS NO MOSS),,the song.
i haven't read anything official but i seem to remember that it was not necessarily written about the Stones but..because the Stones were such big fans of Dylan, they sort of HOPED it was a reference to them. I don't knowif BD ever confirmed or denied it.
As for "What's the story with BB?".......well......Once upon a time in a land far far away...there was a small BED & BREAKFAST...........the end