It might be better to look at something similar that people can relate to...
In Taiji, we speak of the Transparent Body. Rickson Gracie speaks of Invisible Jiu-Jitsu.
In the Taiji line of Wang Yongquan, the transparent body is a body so empty, so free of resistance,
that force passes through it as if it isn’t there.
It’s not about disappearing. It’s about becoming undefinable.
There’s nothing to grab. Nothing to clash with. You’re present, but without edges.
Rickson Gracie doesn’t use the same words,
but he uses the same principle in his “invisible Jiu-Jitsu.” He doesn’t fight force, he absorbs it.
He doesn’t oppose your structure, he slips through it.
“If my opponent uses strength, I use relaxation. If he uses speed, I use timing.”
Rickson Gracie
Both arts listen before they move.
Both do more with less.
Both find control not in domination,
but in alignment, sensitivity, and timing.
Taiji empties to neutralize.
BJJ empties to submit.
Aikido's Aiki, and Invisible Jiu-Jitsu share many physical and strategic parallels with Taiji,
they do not operate with the same underlying framework of intent (意 / yì) and qi (氣).
It's different.
This means that while we can see similarities, we cannot really talk about the underlying principles without agreeing on the same theory by which they are employed.