Well, I'm going to say Bird, and not just because he's my favorite haha. I've always felt that Jordan ruined the game and got away with murder on both ends like no one else in history, from his first game, save for Lebron. It is my personal view that, had Len Bias and Reggie Lewis played together with the Big 3 and Danny and DJ, Michael wouldn't have 6 rings. He would have been lucky to win half as many. The 90s weren't even close to the 80s, in terms of the level of competition around the league, and Jordan never had that rival, quite honestly. Bias and Lewis would have been such adversaries. Reggie played Michael tougher than anyone, and had the ability to block his shot, which no one else in the league ever did, and every time Pippen tried to guard Lewis, #35 routinely lit him up for around 30 points. And Bias had the one ability that no one else who ever played against MJ did - the ability to post him up, assuming of course that Michael would guard him, depending on the situation. The guy was like Dominique Wilkins mixed with Bernard King, but with defense and a jump shot that Michael never even came close to, even by the end of his career. There would have been so many great games. Sigh. That's part of my problem with Jordan.
My top five would probably be Bird, Russell, Kareem, Magic, and Chamberlain. Wilt's dominance will never be matched. Any time the rules have to be changed for you, that's just nuts. My only issue is that he was mostly all about him, and only won after adopting a Celtic approach to the game, via Bill Sharman, but in all fairness, I never saw him play (and yes, I do know that he once led the league in assists, btw). It's really hard after the first 4, imo. Where would you guys put Jerry West, Oscar, and Elgin Baylor? Who knows - had Bias played, he might be in top 5 of all time, but we'll never know. Sigh. It's just so sad.