What are dead hands? Your hands aren't really capable of doing much more than holding onto the bat. Everyone talks about the hands, but your hand movements (other than fingers) are mostly controlled by muscles in your wrists and forearms.
Technically you are correct, it’s more forearms. The hands TTB , creating a HPP. The hands do much more then hang onto the bat, been there done that (hands just hold onto the bat and rotate the hips/shoulders).