[MizunoJoe]

We are getting statements here that may apply to Hitting but not Swinging. For Swinging, it is only necessary to keep the butt of the club ahead of the clubhead through the Impact Interval and to keep it from backing up, which does not require a lot of mass. Swinging produces a "whallop", which comes solely from CF. Mass can contribute only to the extent that it can provide left arm speed from rotation. This idea of getting more mass into the stroke is a Hitting notion.