Within the Projective Dynamic Logo (PDL) framework, the Hubble tension was resolved in D26 by expressing the ratio H₀ₗocal/H₀CMB as √ (σ (Nₗocal) /σ (NCMB) ), where σ (N) = 1− (1−κ) N is the surface engagement fraction derived from the proton integer quintuplet (24, 28, 930, 10087, 11017) and κ = Rₛurf/Rₜot = 310φ/11017 ∈ ℚ (√5). In D26, the parameter NCMB ≈ 40. 8 was calibrated from the observed Hubble ratio. The present paper removes this calibration entirely. We show that NCMB = 40 is the floor of the PDL neutron mass gap Γₙ = 6μₙ − Rₜot (n) = 40. 102, a structural integer derived independently in the PDL nuclear stability programme (D22) from the neutron integer quintuplet without any cosmological input. The derivation uses only the proton quintuplet, the proton–neutron compatibility constraint Rₜot (n) = Rₜot (p) − (Δn+1) ² = 10992, and the CODATA 2022 value of μₙ = mₙ/mₑ. No cosmological observable enters. With NCMB = 40 (structural, from D22) and Nₗocal = 120, the PDL framework predicts H₀CMB = 67. 26 km/s/Mpc, within 0. 27σ of the Planck determination 67. 4 ± 0. 5 km/s/Mpc, with no adjustable parameter. The Hubble tension is now a fully structural prediction of the PDL programme: its amplitude is encoded in the integer architecture of the neutron, which descends by exact combinatorial derivation from the same proton quintuplet that fixes the fine-structure constant and Newton's gravitational constant. As a secondary result, a numerical conjecture for the coherence leakage εG is reported at 17 ppm accuracy using only structural quantities κ, C = 575/576, and Rₜot = 11017. If proved as an exact identity, it would complete the parameter-free derivation of all three fundamental couplings α, G, and H₀ from the single combinatorial object (24, 28, 930, 10087, 11017).
Cédric Laubscher (Sat,) studied this question.