Elon Musk's informal September 12 social-media reply of "Dario is right" to Anthropic CEO Dario Amodei's "We Must Pace the Frontier" essay on managing risks from automated AI research created initial trader interest, but the market priced near-certain "No" because a brief endorsement never translated into formal addition of his name to the Pacing the Frontier signatory list by the September 30 deadline. Frontier AI labs face intense competitive pressure to advance large language models and agentic systems, yet Musk and xAI issued no further commitments, unlike OpenAI's concrete pledge for independent evaluators. With resolution on October 1 and no verifiable signature, traders viewed the gap between casual agreement and binding participation as decisive, leaving only remote possibilities such as an unreported last-minute filing or redefinition of "signs" to alter the outcome.