Mr Bishop
Do you mean to sustain the force that keeps the shaft twisted away from you or the force that could rotate the whole upper arm flying triangular wedge?
Probably something else, I guess?
Well based on the symposium and lots of other things I've been reading plus some intuitive guidance I realize that the golf swing is a sequence of torques we call the kinetic link/chain/sequence. It starts by rotating the right leg in a twist fashion to get the right knee into good position over the inside of the right foot (for those who don't already have their right knee inside).
Then once that happens the right leg pushes the right hip forward and torques it around your left hip. That "bump and turn" of the left hip stretches the left lat muscle (and to a small degree the right lat muscle with the right hip) which allows for greater pull of the lat muscles. That pull of the lat muscles torques the shoulders around and simultaneously pulls the elbows downward toward your rib cage for both arms.
The left tricep muscle resists against the clubs inertia while the left lat does the work of pulling the whole left arm. The right arm has a slightly different move where depending on the position of the right elbow the right tricep either assists with the left arm pull (pitch elbow) or it pushes (punch elbow). In both cases you are applying torque to the club through the top side of the shaft to swing around the left wrist joint.
It is this final torque that is important to us. Each successive torque requires that it be activated at or slightly before the peak speed of the previous torque. The one rotating the shaft around our left wrist must be started soon enough so that we can apply maximum speed at impact, but not so soon that we run out of torque before we get there.
An attempt to sustain the lag can result in someone reaching their peak speed too late and thus wasting all of that energy they built up. If they apply the torque too soon then they don't have any left by the time they reach the ball and then the only torque being applied to the swing at impact will be whatever the shoulders provide.