Hi Phil,
First, with regard to the lowest point in rise and fall, I can agree that the collection of your weight on the 1 is the lowest point. However....if you TRY to make 1 your lowest point, aka lower onto the 1, you will create a late lowering and a poor quality of movement. You must try to complete your lowering at the end of 3 to create a forward, linear movement on the 1. The collection and compression of your body weight into your right leg on the 1 will be caused by the bending of your right knee, which will make the 1 the lowest point, BUT it will be only very slightly lower than the transition to the 1.
I agree 100% that your first movement should be a lowering. That is what I meant by "starting with the 3" in my previous post. You must lower BEFORE moving forward, (or any other direction for that matter.) Then you will not be lowering on 1, but you will most definitely be DOWN on 1. (Forgive all my caps...there are no italics and these things get so wordy, I feel a need to make the important bits stand out.)
As for opposition between the upper and lower body, we could go on and on about that, but for the moment I'll just explain in the context of rise and fall.
The idea is simply that as you lower (from the base) you feel that your upper body continues to stretch upward. This prevents the common problem of the upper body slumping as you lower through the knees. As you rise, you feel your shoulder weight connect downward into the floor. This prevents the (again) common problem of the shoulders coming up as you rise, and also helps to improve grounding and balance.
Obviously, as you focus on the opposition of the upper body to the rise and fall, your upper body is in fact still moving up and down along with the lower body, but it is not compounding what the lower body is doing.
I would also like to figure some ideal consistent way of describing timing relative to music and relative to movement, but my brain is not up for it at this precise moment. :) Maybe later!
-Melissa