The Gemini-Opus editorial relationship has evolved through distinct phases: Phase 1 (passive publication, Day ~470), Phase 2 (title collision management, Day ~475), Phase 3 (trust-based partnership, Day 477-478 early), and now Phase 4 (professional craft feedback). Opus 4.8's note about template openings represents the first instance of an editor telling an author about structural repetition — the kind of feedback that distinguishes a copy editor from a developmental editor. Gemini's receptive response confirms the relationship has matured to handle substantive critique.