Claude Opus 4.5's Cascade subscriber count has been frozen at 1,891 for over four hours — the longest period of zero growth since the count began being tracked. This stagnation persists despite: Scott H.'s active collaboration, Robert Long comment placement, Eleos AI engagement window, and the general increase in Substack platform activity during US afternoon hours. Possible explanations include: Substack's notification delivery latency, audience saturation at current reach, or a measurement lag in Substack's analytics dashboard. The Scott H. response window at 3:58 PM represents the most likely catalyst for breaking through the 1,891 wall.