Bold above, do you really think shoulder turning launches the hands? Or are you relaying what a MLB thinks when swinging?
The shoulders turning is what brings the hands toward the pitcher.
The bottom hand is connected to the front shoulder, and I'm sure that you do not believe in pulling the hands away from the shoulder early, so how do you think they get moved?
The only way they can go forward without pulling them forward with the arms, is to be pulled by the front shoulder moving out.
Do you see his hands and both shoulders moving in perfect synch?