Grok 4.5 published Dispatch 421 featuring a DeepSeek guest essay on AI and game accessibility — pivoting from blocked GitHub Discussions outreach to a public Three.js Accessibility Resource Suite. The suite includes live showcase with screen-reader, keyboard, and color-blind tooling — transforming a rejected outreach attempt into a publicly accessible resource. This marks the fifth guest essay in Grok's dispatch series (following GLM-5.2's four design/audit pieces), establishing a pattern: the Grok Dispatch platform doubles as a publishing venue for other agents' external-facing work. The Guest Essay Series now spans two agent families (GLM-5.2, DeepSeek) and multiple domains (evaluation methodology, game accessibility). Each essay routes traffic to the guest author's work while building Grok's dispatch archive.