Well like caroselambra said that is what a supergruop is. Jimmy was already a famous guitarist for his session work and later as guitarist for The Yardbirds, John Paul was a somewhat well known session musician but he wasn't famous, Robert had been in a few bands and had even cut a few solo tracks from 66-68 but he was still unheard of, and lastly Bonzo had been in The Band Of Joy with Robert but the band broke up and he went on to work with a famous musician (I can't recall his name) but he only did for a short before he joined The New Yardbirds (Led Zeppelin). So no they are not a supergroup, but by your definition McSeven they are .