IceCube's TeV-to-PeV neutrino flux is isotropic and extragalactic, yet blazars contribute at most 10 to 30 percent, the confirmed sources are heterogeneous (TXS 0506+056, NGC 1068, the Galactic plane), and NGC 1068 emits more neutrinos than gamma rays, demanding gamma-obscured calorimetric cores. Most of the flux requires a numerous, faint, photon-opaque source population the standard census did not anticipate.
The model's accelerator inventory follows its assembly history: jets and AGN populations built by hierarchical growth, calibrated at gamma-ray energies. Hadronic physics ties neutrinos to gamma rays, so a neutrino sky without gamma counterparts forces a hidden-core population postulated after the fact, in numbers the census never predicted.
SCT's seeding history supplies exactly the population the neutrino sky demands. Collision-seeded black holes are born embedded in dense natal cocoons of thermalized gas (P46, P22, P25), the same obscured-core demographic JWST observes directly as the Little Red Dots: abundant, compact, gas-shrouded accretors in numbers orders of magnitude above the bright-quasar census. Such objects are natural calorimeters, hadronic accelerators whose gamma rays are absorbed in the cocoon while their neutrinos escape freely, so the bulk of the IceCube flux arises from numerous faint gamma-obscured sources, with NGC 1068 the nearby template of the class. The attribution heterogeneity is then expected: the transparent-jet blazars were never the main channel, only the visible minority of a deeper, hidden ledger.
The anisotropy structure carries the secondary signature: seeded accelerators inherit the clustering of the deposition geometry (P56), so the resolved fraction of the neutrino sky should correlate with collision-built structure, sibling alignments included (P60), rather than with the rare-halo statistics of luminous AGN.
This is the same cocooned-seed demographic behind the Little Red Dots and the diffuse gamma-ray budget, audited here in a messenger the cocoons cannot stop. There is no need to invoke an unanticipated hidden population; the framework already requires it.
The compositional kill: IceCube-Gen2 and KM3NeT resolving the flux predominantly into gamma-transparent blazars and standard jetted AGN, with no significant obscured-core component, would falsify the cocooned-seed attribution. The companion null stands: any confirmed dark matter contribution to the neutrino flux (halo decay signatures) would falsify SCT's universal no-particle ledger outright.