In sports, I think we use the word "legend" just to mean someone who was really good at what they did. Babe Ruth hit a lot of home runs. Michael Jordan scored a lot of points.
I just Googled "legendary athletes." At the very top of the page was an article about the Norwegian marathon runner Grete Waitz. She ran long distances very fast.
About John Curry, I have to agree with Hernando. Curry's claim to fame was that he could move his body expressively to music. After his career as an athlete was over he used ice as a medium to develop and display his artistic vision. He did not, as far as I know, contribute anything special to the
sport side of figure skating.
I suppose that a "legend" ought to have influence on future generations. I want to hit home runs like Babe Ruth, I want to "be like Mike," Look! I'm Tiger Woods. Thousands iof little girls, in the U.S. anyway, are enjoined to "skate like Janet Lynn."
When Michelle Kwan first began skating she wanted to skate like Brian Boitano. Her coach and choreography told her, "No dear, you mean you want to skate like Janet Lynn." Michelle achieve a fusion