How much performance is Training vs natural ability?

I completely agree. Also, IMO it is not possible to judge someones natural ability by initial performances. Just because someone isn’t fast from the get go doesn’t mean they don’t have the potential to progress. IMO natural talent is more about who makes progress more easily rather than how well they are able to perform in an untrained state prior to doing any real training as it seems to me most people think is important.

What I am saying is that a 12 year old boy who runs 13.3 could very well have more natural ability than another 12 year old boy that runs 12.3.

There are other factors that affect performance making ‘natural talent’ impossible to isolate and determine EVEN in a completely untrained subject such as lifestyle factors, varying levels of motivation, confidence, among other things.

People just get to caught up in worrying about ‘natural talent’ IMO.