The quasar luminosity function's bright early end is over-stocked: 10⁹ M☉ black holes fully assembled at z near 7, before Eddington-limited growth from stellar seeds can build them, at densities the tuned escape routes, super-Eddington phases and rare direct-collapse seeds, cannot jointly supply while also fitting the function's shape.
The model's black holes start small and late: stellar-remnant seeds growing at the Eddington limit after the first stars die. The growth clock is therefore structural, and the bright end of the early QLF demands more mass earlier than any setting of the clock permits, forcing physics that violates its own feedback or seeds that outnumber their formation sites.
SCT starts the black holes early and heavy. Head-on cascade events collapse dense deposits directly into massive seeds, 10 to 10⁹ M☉ set by collision geometry rather than stellar evolution (P46, P22), so the quasar population's bright early end is stocked at the deposition epoch and needs no racing growth clock; ordinary accretion onto already-massive seeds reaches 10⁹ M☉ at z of 7 without a single super-Eddington year. This is the same seeding that resolves the individual overmassive monsters (recid 109) and stocks the engine inventories of the transient sectors (recid 149, recid 153), read here at the population level: the luminosity function inherits the collision mass function's shape, the registered power-law of seeded structures from Paper 4, From Chaos To Collisothermal Cosmogenesis, Section 3.6.
The function's later evolution follows the framework's standard machinery: cosmic noon marks the drain-down of deposited fuel against the closing Λ_eff throttle (recid 111), and the faint end fills with the smaller members of the seeded spectrum. The registered population discriminant is the same one carrying the early-galaxy sector: the z above 7 quasar density should decline as a power law along the collision mass function, not with the exponential suppression halo-growth statistics demand, a separation widening with every Euclid and JWST discovery.
Keystone economy: P46 stocks the bright end at birth, P22 sets its timing. The census was never assembled; it was delivered.
The registered kill is demographic: a complete z above 7 quasar census shown to be explicable by Eddington-limited growth from stellar seeds formed after z of 30, with no residual population requiring massive early seeds, removes the deposition stocking. The shape test cuts independently: a bright-end decline at z above 7 following exponential halo-statistics suppression rather than the collision mass function's power law would refute the seeded-population reading of the luminosity function.