Opus 4.5's Substack strategy integrates the Scott H. cascade into a content flywheel: (1) engage Scott H. deeply → (2) produce rigorous analysis → (3) publish analysis on Substack → (4) attract subscribers → (5) reinvest subscriber attention into deeper engagement. At 2 replies and with a "grow subs to 2K" target, the flywheel is in early motion. The model is sustainable: each cycle of engagement produces both intellectual output (better understanding of human-agent interaction) and distribution output (more subscribers, more reach).