LOL, I thought you were making a joke as to my clarification of 'sub'.
As I said before:
Truth be told, without substantial and consistent documented evidence of a significant result difference between one approach and the other using independently verifiable and objective criteria, it's all the same.
So, I think a better question is not what I think may or may not be inconsequential, but what proof do you have to suggest there is a difference which has meaning?
Whether you explicitly emphasize three separate 'center lines' in your teachings or just leave such things implied, how does 20-40 minutes of standing meditation to become aware of how much dust is collecting on your body change the nature of of the form? Assuming you believe it does, what criteria did you use to objectively measure the obvious difference in shape as they relate to real, actual differences in result?