Again Weldon, you've narrowed your goalposts from "coolest story in the sport this century" to "coolest story this century of an athlete who tried hard in their sport and didnt get crazy success instantly, but then found success later on in life at a time people don't usually breakthrough."
Like, okay, yes Keira might win that criteria, but it's so narrow there really isn't much point in debating it. In the broader "cool story coming from an unlikely background" then no, it doesn't win out in America let alone the world.