Control order is logically irrelevant for a multi-controlled-X gate but can become physically consequential after ordered ancilla-chain synthesis. This work derives and validates a shared-end-first ordering rule for nested-control cascades, using reversible Binary-Addition-Tree (BAT) successor circuits as the primary case. Under Maslov clean-v-chain synthesis, pre-optimization CX cost is order-invariant, whereas shared-end-first ordering exposes P(m)=(m-4)(m-3)/2 inverse relative-phase-CCX pairs across stage boundaries; standard optimization removes 6P(m) CX, giving 12m-31 for QBAT after an independently derived two-CX terminal identity. At m=20, retaining an ascending control list after mirroring the BAT direction yields 1,025 CX, while mirroring the chain orientation restores 209. A disjoint-target nested cascade reproduces the same cancellation count for count, showing that BAT target geometry is not required; an ordered dirty-v-chain control shows zero orientation advantage, delimiting the mechanism within the tested synthesis families. Independent ripple-carry baselines give 11m-28 CX on FULL connectivity, so the QBAT/RC ratio approaches 12/11, with equal natural width 2m-3 in the tested QBAT-A1 and INC_RC implementations. The contribution is a synthesis-ordering rule that exposes cancellation to an existing optimizer, not a new optimizer pass or a universal MCX rule.

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