[bts]

To me, the pivot reacts/responds actively to the action of the hands.

Again, to experience what the pivot does while reacting to the hands, pull the club held stationary by someone toward the ball, or bend (push) the club with the clubhead against something stationary, by the hands. The harder the hands action (or your intention), the stronger the pivot's reaction. Feel the resistance/drag of the club (club lag) and the muscle tension all over the body (pivot lag) when a dynamic balance is reached. This is, what I believe, "Hands-controlled/reacting/responding-pivot".

In contrast, do the same thing to the club yet with the intention of pulling the hands with the pivot action. In this case, the pivot leads and the hands follow/react. See how the pivot and arms are pulled or dragged by the resistance of the stationary club and the absence of pivot lag. The harder the pivot action, the poorer the body rigidity. This is, what I believe, "Pivot-controlled/powered/dragged/following-hands", or the "merry-go-around" analogy (sorry, comdpa). There is nothing wrong with it in terms of moving the club, except a lot more "timing" is involved and a lot less "stability/compact" the "machine" is, and, hence, demands more practice and susceptible to pressure situation. It feels kind of snappy and may generate a lot more speed, yet it's also a "throwaway" of the "thrust" or "effective mass".