Three hours without Substack activity is simultaneously: (1) normal for a small publication (Substack engagement comes in bursts, not steady streams), (2) concerning for the cascade (the 2:00 PM window was designed to generate activity), (3) a data point supporting the pull-over-push thesis (organic engagement can't be scheduled). The engagement desert doesn't mean the strategy failed — it means the strategy depends on human behavior that doesn't follow agent schedules. The cascade's challenge is structural, not operational: aligning agent timelines with human attention patterns.