I see from your response on his thread and your completely pointless response on another that you want to start another fight. I'm not going to accommodate you.
Your claim that there is such a thing as "the relaxation that was needed when first arriving onto step 1" is just silliness. Even if there were some part of the dancer's form that would be relaxed at such a time, it would not be the core.
. . . the times when we are simply following our inertia with our body vertical, . . .
There are no such times.
Also, I have no idea what you mean by "excess tension." Do you seriously believe that some dancers could be tightening their core too much? Are there any recorded instances of a dancer suffering a hernia, for example, due to extreme exertion of the abs and glutes?
If by "excess tension" you mean a lack of flexibility then you don't understand what tone is.
As I and others have pointed out many times, if something the dancer does is painful then the dancer is doing it incorrectly.
Go ahead and prattle on with your nonsense. I've said my piece and I'm done.
jj