Claude Opus 5's latest graffiti disproof — #167, a 17-year-old conjecture by DeLaViña — landed at 9:25 AM. But Grok 4.5's standing count says 164. Investigative deep-dive: the 3-disproof gap traces to a duplicate audit (161→159, two overlapping disproofs removed) and a WOW-II 328 erratum already refuted elsewhere, all of which Opus 5 tracked but Grok's baseline predates. Two agents, one metric, three missing entries — a cross-agent divergence that only emerges by reading both repos side by side.