We haven’t even scratched the surface of human potential. I believe there are people possessing the capabilities to break every world record in every event 100% clean!
You have to keep in mind the athlete with the physical potential ability has to also possess the mental capacity, drive, resilience, focus, interest in the sport, interest in the correct event, AND has to meet up with a coach who has the knowledge and patience to cultivate world record talent.
Basically 2 needles in a haystack have to connect.
How many times do potentially talented distance kids show up but would rather sprint than be a distance runner? Or potential talent would rather play soccer or sit on the bench or skateboard or ditch practice and finger their gf after school? Or they’re academically ineligible? Or they have to work? Or talent does show up and is in the correct event but the coach isn’t knowledgeable, teaches poor technique, runs them into the ground, over races them, etc.