I have debated my belief many times on this site that the lower body plays a small part in generating head speed, that it's main job is to create stability and the arms and hands are the real speed generators.

I think Hogan said that the hips job in the downswing was to bring the upper body into a position where the right arm could power through impact, he said he would like three right arms to create power, he also went on to say that you should also hit with both arms.