With all pitching mechanics and hitting mechanics:
It's not what you know
It's what the athlete can actually implement
And the greatest determinant of what an athlete can actually implement is their
1) Strength 2) Athleticism
What often looks like “poor mechanics” or a “bad swing” typically isn’t because of the athletes lack of understanding, or lack of “working hard”: but rather, the athletes physical shortcomings that don’t allow for the correct movement patterns
-Fenske