[brianid]

Most of the clubhead speed is provided by #2, #3 is mainly a delivery mechanism, which is why the emphasis is on #2. A #4 & #3 two barrel pattern isn't realistic, because if you load #4, the right elbow bends, cocking the left wrist, adding #2.

MJ,

I agree with that if we are not turning or pivoting. But while we are turning/rotating our bodies towards the target, would dumping #2 add to the speed of the turning pivot?

And to me, it will just add inconsistency because you are delivering the Sweetspot "vertically/downwards/slicey" rather than "directly head-on" as when you deliver it thru #3.

Imagine yourself already into releasing #4 (your pivoting already). During pivoting, would you rather "axe" the Sweetspot into the ball, or would you rather "slap" Sweetpsot into the ball face-on?

Clubhead Speed will be most efficiently attained by Centripetal Force, and that is, in a golf swing, the Pivoting (body) and the Rolling (L hand).

To illustrate, lets take an Ice Skater for example. When he/she is turning with another Ice Skater, would the 2nd Skater (the farther one) move faster if the 1st Skater dumps the 2nd Skater to the ground vertically, or if the 1st Skater throws or pulls the 2nd Skater to the target horizontally?