Here's a great athlete that took a long hiatus from golf for years. He was a ski instructor, football player, baseball player, etc. I took him to a Titleist Performance Institute location and they said he had the greatest (initial) rotational shoulder speed of anyone they'd tested, including Tour players. And, he couldn't hit it out of his shadow. He was the poster child for over-acceleration.
One of the real problems with this guy was deciding on which side of the ball to put him. Years ago he'd played golf right handed, but he was only successful as a left handed batter in baseball. Right handed batting was unsuccessful. He throws right handed, writes left handed, kicks with the left foot, etc. It was apparent after a few lessons that it was going to be a tough road, because he was so comfortable batting left handed. The saving grace was that he could kill you with a baseball in his right hand. When hitting as a right handed batter, he had problems generating any speed. His Pivot didn't work well.
We had a breakthrough yesterday. We've changed too many things to count since we started. But, we were finally able to change his Start Down speed. It changed his loading and acceleration. Impact was infinitely better, and the ball was compressed.
In the pictures, I tried to synchronize his hands. Both were Total Motion, but it looks like a different person.