Rotation curves at fixed mass span core-like to cusp-like shapes, far beyond simulated NFW scatter (Oman 2015), yet the Radial Acceleration Relation ties every curve tightly to its baryons (McGaugh 2016). The dark halo must be simultaneously universal for the RAR and variable for the diversity, and no feedback prescription delivers both.
A collisionless particle relaxes toward one profile, so the model's halos are near-universal by construction, and all diversity must be beaten in by baryonic feedback while the RAR's baryon-only tightness must survive that beating. The particle picture has no parameter that varies between galaxies in the right way.
SCT has exactly the galaxy-by-galaxy parameter the data demand. The apparent dark halo is the coherent amplification of the visible matter, A(N, σ_v, R), governed by the coherence function C = exp[-σ_v²/v_cross²]: systems with quiet, comoving kinematics amplify toward the virialized fixed point A* = 5.970 = 1/f_b, while kinematically stirred systems amplify less, sliding toward A of 1 in the fully stripped limit. Rotation-curve diversity at fixed mass is the coherence state varying between galaxies, the single physical dial the universal-particle picture lacks (P50, P52). The RAR's tightness is the flip side: because the amplification acts on the baryons themselves, the baryon distribution always predicts the curve, with g† = 1.2 × 10⁻¹⁰ m/s² marking where the mesh term overtakes local gravity.
The framework's confirmations are already registered in Paper 13, From Chaos to Coherent Gravity: the rotation-curve transition radius tracks the disk scale length at r_transition = 3 R_d across the SPARC sample at correlation 0.999, the Milky Way's Keplerian decline beyond the disk edge follows from A saturating at A*, and the dark-matter-deficient diffuse galaxies are the predicted high-σ_v decohered limit. The registered diversity test is direct: RAR residuals should correlate with each galaxy's σ_v/v_bulk, the coherence diagnostic, rather than with feedback history.
Keystone economy: P50 supplies the mesh, P52 the amplification, and one coherence dial replaces every tuned feedback story.
The registered kill: if RAR residuals across the full SPARC sample show no correlation with σ_v/v_bulk at better than 1σ, the coherence-state diversity mechanism is refuted. WALLABY and SKA expand the test by orders of magnitude: rotation-curve shape uncorrelated with kinematic coherence state, or diffuse galaxies failing to show A falling monotonically with σ_v/v_bulk, would break the M6 reading of the diversity sector.