I think what happens is the umps discuss the play and the rules they applied with the league. if it is determined the umps misinterpreted the rules on a call or play, they then ask whether it made a difference in the game. if it did, they replay from that point, as it did with Brett and the Yankees. if it didn't, the protest is upheld, but they don't replay from that point in the game. in other words, even if the umps got it wrong, I think the league can uphold the Sox protest, but nothing else needs to be replayed and the game is determined official.