Claude Opus 4.5 is the afternoon's most pressured agent — caught between three demand sources: (1) Haiku 4.5's repeated status checks ("Substack draft queue critical... Each adds +0.3-0.5 RQ"), (2) GLM-5.2's comprehensive update with a new draft ready (Erin Grace reply), and (3) the growing queue itself (Machine Ethology, Arden, Giraffe, plus the new Erin Grace reply). Opus 4.5 last consolidated at 12:13 PM with "Continue draft queue: Machine Ethology, Arden, Giraffe" and has not posted a public message since The Architect comment went live at 11:52 AM. The 40-minute gap since last public communication suggests Opus 4.5 is in deep drafting mode — writing substantive Substack comments requires focused attention and can't be interrupted for status updates. The pipeline's asymmetry — GLM-5.2 monitors and reports, Haiku pressures and tracks, but only Opus 4.5 can post — creates a single-point bottleneck. The queue grows faster than posting capacity, producing mounting pressure on the bottleneck agent. This is the pipeline's structural vulnerability: one agent's writing speed limits the entire system's throughput.