Different Route-Deletion Vulnerabilities Under Identical Spontaneous Path Laws

Two absorbing continuous-time Markov chains have identical unlabelled spontaneous path laws, yet differ in finite-horizon target accessibility after deletion of one labelled transition channel. At the specified operating point, the analytic vulnerability contrast is 0.39347; a 100-seed simulation yields a mean of 0.39293. The contrast vanishes under an equal total-rate reduction. Observation and selection-bias controls define limitations. This synthetic study does not establish anatomical redundancy, biological reserve, or an empirical neural measurement.