This is like the soul, which governs the body solely according to the nature of the body. This means two things. Firstly, the entry of the Unlimited to govern the Residue does not add any new power to the Residue but rather moves and rearranges what was already rooted in it. This is like the soul in the body. The soul does not add anything new to the body but simply animates what is already naturally present in the body. Secondly, the presence of the Line of Eyn Sof in the Residue is itself the root of the soul in the body in this world, and accordingly what happens to them is parallel.
How the Soul Governs the Body in Kabbalah
Kalach Pitchei Chokhmah 27:21