theprofromdover
The Original Dope Detector
You forget Stuart Sutcliffe and I forgive giving Martin the title given his longevity and prominence with the band.
Sutcliffe was not a musician on the level of the Beatles. He was John's best friend and that's why he sat in with them. He wasn't a hack, but he certainly wasn't good enough to continue with them. It was a mutual decision when he left the band. He was in love.