User blog comment:JakePT/Galaxy at War Effects All Saves/@comment-2228081-20120127011738/@comment-76.170.149.121-20120131223304

That is not the issue. Some people have multiple saves because they want to see multiple endings. What if people want to see the good ending first and use the multiplayer? If multiplayer affects all saves, then it might ruin the players attempt to see the bad ending.