Centaurus A's satellites co-rotate in a plane: about 80 percent of velocity-measured members share coherent motion, a configuration found in under 0.5 percent of comparable simulated hosts (Mueller et al. 2018, 2021). It is the third consecutive nearby giant, after the Milky Way and Andromeda, with an organized satellite plane, driving the joint ΛCDM probability toward one in a million. The transient-alignment defense built for the Milky Way does not export, and isotropic accretion cannot supply shared orbital angular momentum.
Satellites arrive by stochastic subhalo accretion from quasi-random directions, so their orbital angular momenta are uncorrelated by construction. Thin co-rotating planes are then transient flukes, and three-for-three among well-sampled hosts is a statistical sentence the model keeps appealing.
SCT forms each host and its satellites from one collision debris field carrying one angular momentum vector, J = μ(b × v_rel) (P31): the satellites condense from the same rotating debris, so co-planarity and co-rotation are entangled from the outset as two expressions of one initial condition (P32). The Centaurus A configuration is not a fortunate viewing epoch; it is the generic outcome wherever a debris field fragmented, which is why the same forbidden structure recurs at every adequately sampled host. Universality is the prediction: planes around all hosts, with co-rotation fractions high wherever the system has not been dynamically scrambled since seeding.
The model sharpens into geometry tests: plane orientations should correlate with the host's larger debris context, satellite plane normals aligning with the local filament J and with neighboring hosts' planes (the Local Group's M31 and Milky Way planes share orientation statistics no accretion model arranges), and plane thinness should anticorrelate with co-rotation fraction as later traffic thickens both together. Each is measurable in the ongoing distance-velocity campaigns.
This is the same single-J inheritance behind the missing-satellite geometry and spin-filament alignment. There is no need to invoke serial statistical pardons for every new host that joins the pattern.
The registered kill: a systematic survey of twenty or more adequately sampled hosts (SAGA, ELVES extensions, Rubin-era velocity campaigns) finding co-rotating planes at the ΛCDM incidence of roughly half a percent, rather than ubiquitously, falsifies inherited co-rotation. Centaurus A itself remains testable: completing its satellite velocities and finding the coherent fraction collapsing toward isotropy with fuller sampling would retire its membership in the pattern.