The PIVOT transports the POWER PACKAGE. Its a MOTION. The direction, or as you are want to say "alignment" of the pivot is dependant on stance line, hip action, etc,etc.
Pivot work is not done after power package transportatin...after power package is blasted into orbit...ie. arm swing....it continues to move to allow power package to maintain in plane line requirement...
At least that is the way I see it.... it transports and powers and aligns the power package until blast off( release acc.4)...then it moves to allow maintaining of FLW and straight plane line tracing....more accomodating motion rather than powering motion.
Please correct me if you think that this is wrong. Thanks.