Many massive disk galaxies either lack classical bulges altogether or host bulges whose kinematics, ages, and shapes are largely decoupled from their surrounding disks (Kormendy & Kennicutt 2004; Kormendy 2010; Mayer 2008; Brooks & Christensen 2016). Pure disks and pseudo-bulges are common even at late times. Hierarchical ΛCDM expects frequent mergers plus low-angular-momentum halo tails to build substantial classical bulges tightly linked to disk assembly.
The standard model assumes bulges and disks co-evolve tightly through hierarchical merging plus secular gas funneling. Decoupled bulge and disk populations require either suppressed merger histories (which conflicts with halo-merger-rate predictions) or fine-tuned secular evolution that produces the observed independence in stellar populations and kinematics.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, bulge and disk are predicted to inherit J from related but distinguishable cascade-stream events at different mass scales, naturally producing the observed decoupling. The cascade impact-parameter geometry deposits angular momentum J = μ(b × v_rel) (P31, P32) at every level; J ∝ M^(5/3) means bulge-mass and disk-mass components inherit J from cascade events at their respective mass scales.
Collision-seeded structure (P22, P25) deposits multi-component proto-galactic structure simultaneously: the cascade thermalization of pre-existing matter from prior cycles produces both the bulge-precursor central concentration and the disk-precursor extended baryonic distribution at deposition. These two components form from cascade-stream events with different effective J/J_circ ratios, so their stellar populations and kinematics evolve independently from formation rather than after a hierarchical merger.
Sibling pockets (P58, P59, P60) modulate this through gravitational coupling at multi-Mpc scales, providing the boundary conditions that further differentiate bulge and disk evolution paths. The same M3 framework that produces the cosmic-filament J-vector inheritance (recid 83), the satellite-plane co-rotation (recid 130), and the cluster spin axes perpendicular to filaments (recid 27) produces bulge-disk decoupling. Pure-disk galaxies (no significant bulge) correspond to high-J cascade-stream events that produced minimal central concentration. There is no need for suppressed merger histories or fine-tuned secular evolution.
If precision JWST + Euclid + Roman bulge-disk surveys find bulge and disk stellar populations always tightly correlated at the 5% level (no significant decoupling, no pure-disk-only population), the M3 dual-J cascade-inheritance is refuted. The signature SCT prediction is bulge and disk J/J_circ ratios tracing distinct cascade-stream histories rather than a single merger sequence.