For the same reason a great mechanic isn’t necessarily a world class Racecar driver. They are different skills. Sure the Mechanic would probably be a good driver by virtue of their other skillset, but there is no reason to think he/she would be great at one because they are great at the other.
The greatest coaches and trainers in the world can observe and teach a world-class player how to improve, but that mental ability almost never translates to having the physical gifts that the athlete has.
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