The Magellanic Clouds are a bound, gas-rich, interacting, stream-trailing binary on first infall, anchoring the Milky Way's satellite plane, and analog surveys find only 3 to 4 percent of comparable hosts with two such bright companions, with full LMC-SMC-like configurations at the percent level or below in simulations (Liu et al. 2011). The laboratory in which ΛCDM's small-scale tests are anchored is itself a stacked improbability of the model.
Independent stochastic accretion makes luminous satellite pairs multiplicatively rare: a bound bright binary needs a pre-assembled group or improbable capture, and its gas richness, interaction, stream, plane membership, and present-epoch infall each multiply the penalty. The model can only condition on the outcome it cannot produce.
SCT condenses satellite systems from a single rotating debris field (P31, P32), and fragmentation of a coherent stream is naturally clumpy and correlated: adjacent condensations share position, velocity, and angular momentum from birth, so bound luminous pairs are an expected fragmentation mode rather than a stacked accident (P58 makes the same point at pocket scale, where isolated single births are the rare case at about a quarter percent). The Clouds' binarity, their shared gas reservoir, their mutual interaction, and their membership in the polar plane are one configuration inherited from one deposition stream, not five independent coincidences.
The first-infall timing reframes the same way: debris condensations arrive on correlated orbits set by the stream geometry, so a prominent pair on its initial approach at the present epoch reflects where the local debris field is in its dynamical unwinding, shared by the plane the pair anchors. The analog statistics become the test: under fragmentation, hosts with satellite planes should preferentially be the hosts with luminous pairs, a correlation independent accretion does not produce.
This is the same debris-fragmentation physics behind the satellite planes and the missing-satellite census. There is no need to invoke conditioning away the improbability of the system every other test stands on.
The correlation is the kill: SCT predicts pair-hosting and plane-hosting to be statistically linked across hosts, since both trace coherent debris. SAGA-class surveys finding luminous pairs distributed independently of satellite-plane incidence, at rates matching independent accretion, would falsify the fragmentation reading. Locally, Gaia orbital reconstruction demonstrating the Clouds were captured separately, with incompatible debris origins and uncorrelated angular momenta, would break the shared-stream account.