This note takes the second step of the mass-sector frontier of the fermionic-matter sub-programme of Cosmochrony, and draws a sharp negative conclusion at its entry. The companion line note fixed the determinant line Lₘ = ^2 (S_{}) as the Yukawa coupling line and the generation-level assignment from E_{}^2|₂^{₃₆₄₍} = diag (1, 12 + u, 12 - u). We ask whether the squared projective residue determines the Yukawa morphism itself, and show that it does not. The generation-level observable produced by the Schur-residue sector is the positive hermitian square H_{}: = Y_{}^Y_{}, whose spectrum on C^{3₆₄₍} is fixed up to the overall Yukawa norm by H_{}|₂^{₃₆₄₍} = ₘ^2\, diag (1, 12 + u, 12 - u). The morphism Y_{} is then determined only up to a chiral polar factor, Y_{} = U_{}\, H_{}^1/2, with U_{} a unitary chiral map on the support of H_{}. Hence the squared residue fixes the squared Yukawa levels but not the morphism: U_{} carries the chiral orientation, the relative generation phases, and the mixing, while the positive scale ₘ is a separate normalisation of H_{} — none of it visible to the dimensionless level operator E_{}^2|₂^{₃₆₄₍}. Front 3b is therefore closed as a squared-Yukawa-levels result, not a mixing result; fixing U_{} is deferred to a distinct front. All operator identities are verified by exact symbolic computation, with no sampling.
Jérôme Beau (Sat,) studied this question.