We develop a theorem-level treatment of the spin-0+ torsion sector of DefectCartan Gravity (DCG) and its coupling to multivalued Stueckelberg defects. Inthe trace-torsion truncation, all dimensionless weak-field couplings reduce to asingle ratio r ≡ aκ/(4β) that fixes the Brans–Dicke (BD) parameter and Yukawastrength: ω0(r) = 3(r − 1)/(2(r + 1)) and αY (r) = 1/(2ω0 + 3) = (r + 1)/(6r).We emphasize the corrected asymptotics αY → 1/6 as r → ∞: large r alone doesnot eliminate the fifth force, so solar-system viability generically requires a finitescalar range λ0 = m−10 and/or environmental screening. For the defect sector wederive a velocity-dependent one-scale (VOS) system with an effective friction lengthsourced by scalar backreaction and show that, under a sharp but testable trackinghypothesis ξ ∝ ℓfr ∝ t, the network admits an analytic scaling solution with universalattractor v∗ = 1/√2 . Coupling scalar and defect stress-energy at background andlinear-perturbation level yields a two-scale gravitational slip controlled by the scalarCompton scale and the defect correlation scale, and a modified gravitational-wave(GW) damping term tied to the effective Planck-mass run rate. We present a compactobservational program organized in the two-parameter space (r, λ0) supplementedby defect-network parameters.
SIKX HILTON (Tue,) studied this question.