I'm not trying to derail the thread here, but I wanted to ask you about Chelios. Am I the only person who actually gives a lot of props to Chelios for what he's doing in his late 40s? He's trying to play the game he loves, not for the money, but because he loves it (at least as far as I can tell). Even willing to play minor league hockey when he knew his skills had diminished, which has to be a tough pill to swallow for one of the greatest players ever, regardless of age. I honestly don't view him as embarrassing himself at all, he's not pretending that he's a star anymore, he just wants to go out and keep playing. I don't see anything wrong with it, and I'm actually very impressed by what he's been doing (off ice issues aside, of course).
And yes, for sure he's not adding to his legacy, but as you mentioned, he sure as hell isn't hurting it. What he's done in his prime years, no one can take away. And he's not pulling a Messier here (I'm as big a Messier fan as you'll find, but he was the perfect example of a guy who refused to believe that his abilities had diminished late in his career). He's not claiming he's still a star player and that he "deserves" ice time in the NHL. And someone correct me if I'm wrong (I very well could be), but my impression was that he never complained when he was getting benched in detroit.
But either way, to answer the question at hand, I have both Chelios and Robinson around the 9-13 range of best defensemen ever, with Robinson slightly ahead. I just feel that Robinson's playoff record and multiple Stanley Cups are the big factor. Not to say that Chelios was not successful in the playoffs, but Robinson won cups when he was in his prime and as the best defenseman on his team, which Chelios never did. Otherwise, there is not much separating the two IMO.