They won nine titles during that decade. Yeesh. It'd be weird to imagine the 60's Celtics having a "Welcome Party" and Bill Russell talking about "not five, not six, not seven...", with Hondo randomly yelping like Chris Bosh, but they're the only team in history that could've gotten away with it.
In all seriousness, all three players are members of the 50 Greatest Players in NBA history. Russell is the gold standard for all defensive centers, dominating his greatest contemporary and offensive counterpart in Wilt Chamberlain. He used his defense and rebounding as outlets to fuel their offense.
Although Cooz retired early on, he was instrumental in getting the Boston legacy on the map. He had 10 All-NBA First team selections and was a part of six rings. His assists numbers don't quite reflect how good of a facilitator he was because back then, you only got an assist for a pass directly leading to a basket. He was the definition of point guard, and his skill-set is still the standard by which traditional point guards are measured.
And Hondo was the prototypical swingman back in the day. The "Havlicek stole the ball" moment will live forever with Boston fans, and he might be the most clutch member of this group. Some would argue he's the most clutch Celtic ever.