I just bought the first game and started a co-op split screen game with my brother. He plays as the first player under his profile and I play as the second player under my profile. Neither of us has played the single player game at all. Can I start a new single player game under my profile (with a new character) and start at the beginning of the game but still be able to play under our 2 player save later on with him? Meaning I dont want to erase our split screen game save. I just want to have my own single player game going on also.