Rha writes:
The partner dancing forward 'gets out of the way' and crosses the straight line of progression of the partner dancing forward but this does not necessarily equate to crossing into the partner's space.
When you say that the person dancing backwards "gets out of the way" (you wrote forward, but I think you meant backwards), it's the same thing as what I called the directional differential. Someone has to move to the inside.
My point was that the actual amount of difference cannot be as great on a reverse action as it is on a natural action. But that's not to say that there's no differential at all on a reverse. The analogy I've used in previous discussions has been with numbers that represent the degree of "curve". If 0 = no curve, and 3 = maximum curve, then you might have something like this:
Natural Turn
partner moving forward: 0
partner moving back: 3
Reverse Turn
partner moving forward: 1
partner moving back: 2
These numbers don't represent any concrete measurements, just a concept. There are plenty of other mitigating factors, such as the actual amount of turn (the greater the overall turn, the greater the differential), the high degree of flexibility afforded by a dynamic dance position, and so forth.
For example, if you're only dancing a quarter turn, because the differential is less in either direction (natural or reverse), you could definitely argue that the person moving backwards on the reverse can track inside just as much as the person moving back on the natural. But if we look at an opposite extreme -- pivots -- where on a natural the person on the inside of turn deflects to the inside a good 1/8 turn -- I don't think you'd want to do the same on the reverse. I guarantee if you move DC on a reverse pivot while your partner moves LOD, you'll cross his or her space no matter how hard you try to strecth out to the left.
Incidentally, I'm a bit mystified by your expression "loss of alignment". I understand that it's your version of what I call a differential, but what I'm not clear on is the choice of the word "loss". To my mind, an alignment is something you can change or alter, not something you can gain or lose. Just some food for thought.
Regards,
Jonathan