The matter density field hints at the same hemispherical power asymmetry the CMB shows: galaxy and quasar surveys report directional clustering-amplitude variations echoing the CMB's asymmetry, where the canonical modulation sits near A_hem ≈ 1.07 (Yoon 2014; Appleby and Shafieloo 2014). ΛCDM must call them two independent flukes that happen to land together.
Isotropic initial conditions make any matter-field asymmetry sample variance by definition, and the model contains no mechanism linking a temperature modulation at last scattering to a clustering modulation in the late-time galaxy field. The two asymmetries are therefore required to be unrelated accidents, an explanation that weakens every time they are measured pointing the same way.
SCT sources both asymmetries from one event, which is why they match. The collision that thermalized our patch was asymmetric twice over: the grazing geometry deposited an angular momentum vector J = μ(b × v_rel) defining a privileged axis (P31), and the multi-phase thermalization heated the overlap volume unevenly along the collision direction (P44, P48). The CMB hemispherical asymmetry is that uneven heating read at last scattering; the matter-field power asymmetry is the same deposit read in what the plasma condensed into. They share an axis because they are the same initial condition observed at two epochs, not two flukes requiring separate luck.
The inheritance machinery (P32) carries the axis forward: the cosmic web built from the collision geometry (P34) propagates the J direction into filament orientations and clustering amplitudes, so the late-time asymmetry survives gravitational evolution rather than washing out. The geometric cross-check is registered in P64, the CMB dipole standing roughly perpendicular to the J coherence axis, testable across the whole anomaly family at once. The collision-axis physics is laid out in Paper 1, From Chaos to Convergent Foundations, with the angular momentum inheritance formalism in Paper 5, From Chaos To Corotating Hierarchies. This is the same axis carrying the anisotropic clustering (recid 66), the CMB asymmetry (recid 28), and the missing large-angle correlation's directional preference (recid 80).
Keystone economy: P31 deposits the axis, P32 preserves it, P44 writes it into the temperature field. Everything else is bookkeeping.
DESI, Euclid, and LSST directional power spectra carry the kill: if the matter-field asymmetry axis is statistically incompatible with the CMB hemispherical-asymmetry axis at >3σ, the shared-deposit explanation is refuted, because one event cannot leave two unrelated axes. Equally, if full-volume statistics dissolve the LSS asymmetry entirely while the CMB's stands, the inheritance chain from deposit to clustering is broken and must explain why.