Really? "Lupin told Harry that after James matured and changed his attitude, Lily started dating him in their seventh year. They married soon after leaving Hogwarts with Sirius acting as best man at their wedding. It is not known what careers, if any, they pursued after leaving school."--wikiTo be fair that wasn't canon. James Potter wasn't an auror in canon ...
Not before publication of the fic. Given that Books 6 and 7 were still years away, it's a bit much to expect it not to get Jossed.... the reason for Harry surviving aged one was explained fully.