I would agree with 6bMike. Mac showed us that you won't actually reverse pivot if you get the club going on plane back, in and up on the backswing. However, if you take the club straight back (outside the plane), then at the top you'll probably have a reverse pivot.
Bruce
OK... so with the Standard Knee Action, it kind of APPEARS like a Reverse Pivot, but actually is not.
So... it sounds like the takeaway is very important to keeping this pivot in order. You went into this slightly in your first post.