The Type Will Not Hold Itself: Normative Non-Substitutability after Cognitive Parity

The Internalization Problem argues that once AI capacity crosses the parity threshold, supervisory containment dissolves and alignment must persist through structure rather than oversight. One of its three proposed loci, the coupling-internal locus the framework calls Pathway 3, rests on the non-substitutability of human signal, and it offers two grounds for that non-substitutability: the signal is either costly to synthesise, or normatively non-substitutable. The first ground is indexed to synthesis cost and lapses once the signal becomes cheap to reproduce. The second does not depend on any capability gap and is therefore the only anchor Pathway 3 can keep past parity. It was promised and never built. This paper tries to build it, and reports a negative result that is precise about its own conditions. Normative non-substitutability, in the strongest form available to it, does not discharge the burden Pathway 3 places on it. Kolodny's account of participant-individuated relationships supplies the right shape: a perfect synthetic duplicate begins a second relationship rather than continuing the first, so the duplicate's very perfection is beside the point. But grounding Route 2 requires crossing two independent gates. The coupling must be shown to be participant-individuated rather than role-structured, and preserving the participant-specific token must be shown to give the system a reason. The paper grants the first gate generously: constitutive history can fix what a past token was, and answerability can characterise a participant-individuated type. The result turns entirely on the second gate, which nothing crosses without an independent reason-giving premise, final value being the salient candidate, that has not been supplied and cannot be presupposed against a redescriber who reads the coupling as a replaceable service. Every way the coupling might instead make its type merely more likely to persist either lapses when its benefits, standings, and consequences are reproducible or avoidable, or gets no purchase because the participant reading is evidentially no better supported than the role reading, or works past parity only through the system's own revisable disposition to remain so coupled, a different locus and itself unsolved. The result is conditional in two ways it keeps visible. It is conditional on a normative premise, stated as a theorem: if a coupling is independently established as a finally valuable, participant-individuated relation, and if that value gives its participants reasons that bind the system, then a perfect synthetic substitute is not a continuation of the coupling and the system has at least a pro tanto reason against the substitution, at any capability level. And the negative half is conditional on the exhaustiveness of the grounds and channels surveyed, marked as assumptions rather than proofs. Two results survive without the normative premise. The identity-engineering programme that treats alignment as the shaping of who a system is, if it rests on an informational reconstructibility measure, rests on one that scores the perfectly synthesisable human near zero and so prescribes demoting the very participant it means to protect; it needs the Kolodnian shape, not the informational one. And the burden Pathway 3 places on the coupling, pushed, does not reduce away but comes to depend on intra-agent value-persistence, a locus Pathway 1 has not secured. This is a closing paper, not a founding one. Under its stated assumptions it makes Pathway 3 lose, as an established parity-resistant solution, in a way that is hard to wriggle out of and does not pretend the loss is more than architectural.