“I am the greatest,” said Muhammad Ali before his match with Sonny Liston. Michael Phelps is the greatest. Usain Bolt is the greatest. They can’t all be the greatest. Yet, Muhammad Ali was the greatest boxer, for a time. Michael Phelps remains the greatest Olympic swimmer, for the time being. Usain Bolt remains the greatest Olympic sprinter, for the time being. The New England Patriots remain the greatest football team, and Tom Brady the greatest NFL quarterback. For now. Wayne Gretzky’s nickname is, “the Great One.” Sports is easy. We could go with presidents, whether those who think they were (or are) the greatest or those who disputably were. We could even argue over the greatest country.