I believe the Celtics were the first sports franchise that placed special emphasis on the 6th man concept. If memory serves me, both Jones boys (KC & Sam) were subs for Sharman and Cousy. Of course there was Frank Ramsey, Havlicek, Satch Sanders, Larry Siegfried. I think Bill Walton and Tommy Heinsohn became reserve sparkmen at the end of their careers in the Garden, as well.