Structural Silence in Möbius Cosmology: Why Global Topology Can Be Real While Observations Stay Quiet

Möbius Cosmology was never designed to announce itself through large, ubiquitous deviations from General Relativity. It was designed to solve a harder problem: to permit a globally non-orientable spacetime manifold while remaining dynamically indistinguishable from standard gravity throughout the bulk whenever junction activation is absent. In this framework, departures arise only through modified junction conditions confined to compact, horizon-adjacent regions, and even there they are bounded by a strict stability envelope. Recent work translated null consistency with cosmological, astrophysical, and horizon-scale observations into conservative upper bounds on the integrated activation budget, without introducing free parameters, without anomaly fitting, and without claiming detections. This paper explains why that observational quietness is not a weakness but a structural prediction. When topology change is admitted only through tightly constrained junction neighborhoods, silence across most observational channels is expected. As precision improves, null results progressively compress the allowed activation window and force any remaining physical visibility into a narrow set of clean, horizon-proximal tests. Structural silence is therefore not an embarrassment to explain away; it is the natural signature of a globally non-orientable manifold that is locally conservative almost everywhere.