Southern writes
"Is this where the arms, and hands add to it?
Arm and hand action is about a pattern of movement that can affect the loading of the shoulders.
In regards to bat speed the arm and hand action is discussed in reference to a negative move...how to get the hands back and on an inside /out path through properly loading the shoulder unit.
This "arm and hand action" is not used considering or discussing the true swing after launch as a rule
The eternal debate is whether this arm and hand action is equal to a more simple backwards move. It envolves the players conscience ability to move his hands back and stay loaded until toe touch vs. putting the bat in a location that he MUST move his shoulders back in order to hit putting it on auto-pilot.
If the hands start in and to then the brain knows they must go back and away. It is a similar pattern that you see at "hand break" pitching from the stretch. This move gets overlapped by the hips rotating and turning toward the target and torque is created in the midsection. (again similar to pitching)
The debates goes to an argument that having the hands move in the simplest pattern( almost preloaded) is QUICKER( an still fast enough) vs a dynamic path the increases nuero stretch factors that yield more bat speed
( which it does by the way). Opponents say a fast bat that misses the ball is useless.
There are hand path issues and timing issues too, so it will never be solved. Your only benefit derived is that with study and consideration you will likely pick up some points of interest and learn a few things of value.
You will endure a few battles along the way but welcome just the same