hi
you could say the it is the club head or the club shaft, having the extra kick of the shaft adds that all important extra power just at the right second and the new faces on the drivers give that extra power too, but if any of the other things are out the then that dont matter. i take your point about what generates the power but does it matter if you generate a huge anount of power but cant put the face of the club square on the ball, the result is you must do all or it dont matter and they all add you to giving you that power, not just one thing or onr part.
bill