The Unknown Head contains all the interconnections; the uncertainty lies in trying to grasp it.
The uncertainty about radla is not in radla itself — radla contains all the interconnections with structural completeness. The uncertainty is in trying to grasp radla from outside.
Op. 88 sharpens the radla doctrine in a methodologically important way. The reader might think radla is itself uncertain or incomplete. Klach's claim is the opposite: radla contains all the interconnections fully; the uncertainty is epistemic (in our trying to grasp it), not ontological (in radla itself).
This is a structural-philosophical move. The cosmic system at its highest level is complete; what it holds is all of it; nothing is missing structurally. Our inability to specify what radla holds is a feature of us as investigators, not of the structure being investigated.
The Op. 9 we cannot know in essence discipline is the same epistemic claim at the Sefirah level. We cannot know the Sefirot in essence; that would require knowing Godliness in essence. We cannot grasp radla; that would require operating at a cosmic level that is not available to creatures. The structure remains complete; our access remains bounded.
Op. 89 (the Dew of Bedolach contrast — sharpening the unspecifiable character of radla against a specifiable in retrospect descent from A"A's head). Op. 100's underlying reasons are beyond comprehension generalises Op. 88's epistemic discipline to the Partzuf-clothing level.