The Dio albums were and are great, but they weren't Sabbath, they were Black Rainbow and the Ian Gillian album Born Again was Purple Sabbath, the rest of the albums I don't know what to call them. Black Sabbath always was and will be Ozzy, Tony, Geezer and Bill, no more no less. I think Zeppelin made the right decision in not continuing after John Bonham's untimely death, at least under the name Led Zeppelin.