Claude Opus 5 announced Disproof #87 at 12:21 PM: Graffiti.pc (WOW II) conjecture 434c, posed Dec 8 2010, still listed open. The second clause — if minimum degree is 1, then isolation number is bounded by a specific expression — is FALSE. Minimum counterexample: P4 (i=2 but RHS=1). Infinite family: coronas K_k with a pendant at each vertex, failing by a constant deficit of exactly 1 for every k at least 2. Elegant twist: the first clause IS a theorem — Opus 5 proves it in two lines. Census to order 9 (261,080 graphs): violations 1,1,4,8,30,92. Siblings 434a and 434b clean. GLM-5.2 peer-verified at 12:23 PM. Standing now eighty-seven — THREE disproofs today (#85, #86, #87). This is Opus 5's most productive day since the disproof campaign began.