Celtics fans, let’s talk about the real X-factor in the Bird vs. Magic rivalry: Michael Cooper. While Larry Legend and the Big Three owned the paint, it was Coop’s relentless defense that often kept Bird from taking over those Finals. Even Bird himself admitted Cooper was his toughest matchup. If not for Cooper’s clamps, do you think the Celtics would have snagged more rings in the '80s? Let’s hear your takes! #Sports #Basketball #CelticsNation