Never Tell Me the Odds completely negates Tactics Broker, so no one is sacrificed.
Tactics Broker doesn't work on re-rolls. Glossary:
Quote:Once per round before initiative is determined, if this character is in your squad, choose one other character in your squad. Remove the chosen character from play (it counts as defeated) and choose an opponent. That opponent's initiative check result is automatically 1. If a tie requires rerolling initiative, this ability cannot be used again for tie-breaking.