Well, if we are talking about mental toughness then Russel definitely has a huge advantage over Wilt and just about every other player ever. I guess when I think of toughness I am talking physical and the ability to dish it out. Guys like John Stockton, Isaih Thomas, and AI are also very very tough. To me though, mental toughness is a little different. Bird had that maybe even more so then MJ although that is certainly debatable.