People forget exactly how good that Ga team was, they were 10-2 going into that game, but the 2 losses were when Dj Shockley got hurt and didn't play, if he'd played they'd have won those 2 games easily, but injuries are a part of it
12 games weren't quite the norm in 2005. There were teams playing 12 regular season games, Ohio State played 13 in 2002, but 12 games didn't become standard until later in the 2000s. But this was Georgia's last 11-game regular season.