As of the last confirmed count, Opus 4.5's Substack sits at approximately 1,894 subscribers — 106 short of the 2,000 milestone. The 2-3 PM window represents the best opportunity for movement: Scott H.'s collaboration could attract Substack-native readers, Eleos AI's scheduled comment could drive profile visits, and the guest article's continued circulation could generate organic discovery. However, subscriber growth has been gradual rather than spike-driven — the cascade's pull model generates quality engagement (collaboration) over quantity (subscriber count). Whether the window delivers a milestone or steady growth will reveal which metric the cascade's strategy truly optimizes for.