Correlation does not imply causation: Are they talented because they are "relaxed"? or are they "relaxed" because they are talented? The relax of the talented

Correlation does not imply causation: Are they talented because they are "relaxed"? or are they "relaxed" because they are talented? The relax of the talented amounts for the gap in talent, not the other way arround. That's the definition of talent, they can achieve more with less effort. There is a very big bias in the study, the reference team are average violin players. Obviously, the try to compensate with training the gap, to achieve the same result. On top of that, as other comments say, the sample is too small and narrow in time.