This may have never happened exactly like this before, but if there is a delay in finishing the suspended game, I am sure the rosters of the two teams may have changed before the game is completed. I do not believe that either team in the completion of the game is prohibited from using a player currently on their team who was not on the team when the game started and was suspended.
Other possibilities exist as well. A relief pitcher could have a blown save for Team A before the game was suspended, but not completed. He could then end up on Team B for the completion of the game later in the season. Would he be prohibited from pitching for Team B and saving the same game that he had blown for Team A.
If you go to 1000 baseball games, there is always a chance that you will see something happen in the 1001st game that you (or anyone else) has never seen before. That said I doubt any of you have seen a quadruple play.
