Here's an excellent example of what im talking about.
Miggy is saying one thing, but immediately we see video evidence that he's NOT doing what he's saying. The bat is dipping down early and he's swinging upwards. His palm is up, but its also actually tilted more towards the catcher. Harold says "not like this?" and Miggy agrees, even though the video right after is a contradiction.
Most of the high-level all-star type guys actually don't understand their mechanics and why they are successful. I'd say the journeyman/late-bloomers are actually much smarter because they had to struggle for years before actually doing a deep dive to understand their mechanics.