Kashlinsky's dark flow, 600 to 1000 km/s of coherent cluster motion toward an attractor beyond the horizon, likely died with Planck's null reanalysis, but its question survived and hardened: CosmicFlows-4 measures bulk flows near 400 km/s at depths of 200 to 250 Mpc, two to three times the ΛCDM expectation at 3-to-5σ. The model's velocity field is fully fixed by its matter inventory, and the inventory cannot source the measured motion.
In the model, velocity is bookkeeping on density: flows arise only as gravitational responses to the catalogued matter field, with amplitudes capped by the CMB-normalized power spectrum. Coherent motion exceeding that cap has nowhere to come from, inside or outside the horizon, because the model's horizon encloses everything that has ever influenced us.
SCT sources the excess twice over, both from the same origin event. First, inheritance: structures condensed from collision debris carry the debris streams' bulk velocities as birthright (P31, P32), so part of the measured flow is original equipment, deposited kinematics that no local attractor needs to generate, the same physics that quiets the local flow internally while moving it coherently as a whole (P8). Second, the family: our patch is not an isolated FLRW universe but one member of a multi-pocket system (P59), with sibling pockets formed in the same cascade sitting at separations of 1 to 2 Gpc, inside our Hubble sphere and gravitationally present (P60). Their tidal pull adds the deep, attractor-less component that made dark flow seem to point beyond the horizon: the attractor is real and simply is not in the catalog, because it is not in our patch.
The registered geometry makes this checkable: bulk-flow direction should align within 30 degrees of the local cosmic web's angular momentum axis (the inheritance signature), and gigaparsec-scale flow coherence should persist where ΛCDM's velocity field dies away (the sibling signature). The premise foundations are in Paper 1, From Chaos to Convergent Foundations (P52 through P60, the sibling-pocket sections), with the angular momentum inheritance developed across Paper 5, From Chaos To Corotating Hierarchies.
The registered kills: CosmicFlows-class analyses finding bulk-flow direction uncorrelated with the local web's J axis at better than 1σ breaks the inheritance arm, and future surveys (DESI peculiar velocities, 4MOST) finding flows fully consistent with ΛCDM linear theory at all depths removes the excess both arms exist to explain. The sibling arm dies specifically if gigaparsec coherence vanishes once local attractors are properly modeled.