Don't forget Eddie Van Halen. But, look what happened to Van Halen. Without the right lead singer - they went nowhere fast! After Sammy left, they hired a new lead singer, did an album and it fizzled. So, just because you are a great guitarist and a great band, doesn't mean you're going to do great. It takes the whole package (singer, guitarist, etc..) to make it work. Only time will tell if Mark can make it without Scott (and Scott without Mark).
Well, Sammy is now back with Van Halen!!!! It took long enough but they finally reconciled.