Tatum hasn't been good enough to win a title, that is why Boston hasn't won one. If Tatum was good enough, Boston would have won. Tatum could be good enough at some point, but he hasn't been yet. And there is nothing arbitrary about looking at actual champions and figuring out what they have in common. In virtually every instance that is not just a HOFer, but a truly special player in the sports history. Tatum is not yet a truly special player, maybe he gets there, but maybe he doesn't. And if he doesn't, it will be very very difficult to win a championship because the truly special players are the ones that win championships. If Tatum does elevate into that class, then Boston should win a title because almost all of the truly special players have won a championship.