Does the sport produce the physique, or does the physique find the sport?
We tend to think the former, but think of it this way: how many 5’5 300lb triathletes got weeded out at the local level because the body simply wasn’t going to perform well? And then how many decently in shape guys got weeded out at the next highest level because it wasn’t the most ideal body? Etc. Akin to saying “Man, basketball must make you tall: look at the NBA!”
The training certainly will tailor your body to better suit it, but for these top notch guys, a lot of times it was just finding the sport that best suited their bodies and going full tilt into it.
Not a correction or anything, more just an interesting observation.