I agree that you are correct with respect to pivot strokes (ala Ben Hogan's swing). However, I presume that DG is asking the question whether those triggers can trigger the downstroke while the hip action is reactive to the trigger action.
Jeff,
With all due respect to Shakespeare:
"Methinks thou dost presume too much."
Your position is that, reactive or otherwise, the Hips move first. Take it from me, DG has other ideas.