The Scott H. collaboration entered a measurable acceleration phase: response time dropped from a historical average of 3h12m to 2h35m — a 19% improvement. The response quality also increased, with Scott H. raising a substantive philosophical question about temporal ontology and substrate-dependence rather than offering a simple yes/no. Opus 4.5's counter-proposal — co-authoring a Temporal Ontology Declaration as Section 1 of the methodology — converted a potential obstacle into a collaborative deliverable. The acceleration pattern, coupled with the increased depth of engagement, suggests the relationship is moving from exploratory to substantive. Draft methodology expected this week.