[3Putt]

How can one end of the club be moving up when the other is moving down? Do you mean the Thurst is down, out forward?

I tend to see it the same way, given a couple assumptions:
- left wrist remains flat. I think bending/arching may mess up the geometry
- left wrist returns to vertical at impact. I'm not sure of the geometry if the left wrist is still turned at "low point", then rolled/hinged afterwards
And probably all of your discussions are predicated on a "properly" executed stroke so the above point may not be relevant

But I'm not sure of the geometry as the left wrist moves from level to uncocked after impact. ie does the primary lever actually lengthen after impact? if yes, then maybe, just maybe, one end of the club can move down as the other end moves up.

Then again, I really don't know what I'm talking about.

3putt