Brutal Hordechief's activated ability quirks

Brutal Hordechief's ability is implemented as a "replacement effect" for the declare blockers phase. If Brutal Hordechief's ability gets activated multiple times within a single turn (or copied, etc.), currently the active player chooses which one will take effect. This creates a problem if multiple players would activate the ability within the same turn, letting the active player decide who will take control of the declare blockers phase. A judge confirmed me that the correct behaviour should be that only the final one of the abilities to resolve would be taken into account for that turn.