Great game design makes the complex simple, replayability maximum, and abstraction credible.
It’s not how well you roll that counts but how well the dice suit the game.
What Paul said, the transaction is 3 pieces total - of which 1 can be an Ally.
Your second transaction would involve 6 pieces.
4.4.2 … to remove and/or place a total of up to three such pieces in the Suborn Region.