[BerntR]

The power has to come from somewhere. Either left arm, right arm or the pivot. Centripetal force and throwout can only redistribute and conserve the power that has been produced by the above mentioned.

If JB Holms was sitting on his butt, or even better, temporarily paralysed in his core, we would see how much clubhead speed he could generate without using the pivot much.

But still, since you basically have to choose between swinging your arms around the pivot or swinging the arms with the pivot, a full stroke can still be 95% pivot powered even if you get 65% of the distance without using it.

The left arm is basically useless for power generation, and certainly not by TGM standards anyway. That leaves the right arm + pivot for hitters, and pivot only for swingers. The blasting off the chest is powered by the pivot.