FRBs split into one-offs and repeaters with different spectra, durations, and polarization, appearing in hosts from star-forming dwarfs to passive ellipticals (Petroff 2019; Cordes and Chatterjee 2019). Magnetars are secured as one engine yet strain against the most active repeaters and the old-population hosts, and every added channel must be tuned not to overproduce the others (Zhang 2020).
The model's compact-object demography descends entirely from stellar evolution, so FRB engines must be young magnetars or merger products whose rates and hosts track star formation. A population burst-ing from old passive environments at the observed rates has no parent channel, and the inventory grows by one tuned engine per anomaly.
SCT's compact-object demography has two pedigrees, and the FRB dichotomy maps onto them naturally. The stellar pedigree supplies the magnetar channel exactly as observed, young engines in star-forming hosts. The cascade pedigree supplies what the standard inventory lacks: compact objects seeded directly by the collision's dense deposits (P46), with masses, magnetizations, and locations set by deposition geometry rather than stellar evolution, distributed through old hosts and off-nuclear environments where no young magnetar belongs (P25, P28). Engines without stellar pedigrees burst from places stellar channels cannot reach, which is precisely the half of the population the model cannot parent.
The repeater-versus-one-off split then reflects engine class rather than tuning: long-lived seeded engines with stable configurations repeat, while transient events, including interactions within the seeded population, burst once. This is the same cascade-stocked inventory carrying the fast blue optical transients (recid 149) and the overmassive early black holes (recid 109), read at radio wavelengths; the registered population signature is the same too, FRB hosts and offsets tracking the deposited compact-object distribution rather than star formation alone. The seeding mechanics are in Paper 4, From Chaos To Collisothermal Cosmogenesis, with the compact-object framework in Paper 9, From Chaos To Collapse Proof.
Keystone economy: P46 supplies the second pedigree, P25 its fuel and placement. The diversity stops being a tuning problem and becomes a census of two inventories.
Localization statistics carry the kill: if the growing CHIME and ASKAP localized sample resolves entirely into stellar-pedigree channels, with host demographics, offsets, and repetition statistics all tracking star formation and standard compact-object formation, the second pedigree is unnecessary. SCT separately requires the old-host FRB population to coincide with independent evidence of non-stellar compact objects in those environments; passive hosts whose FRB engines prove to be ordinary delayed magnetars would remove the cascade population from this sector.