They would have only needed one two-point conversion.
The score was 15 - 0. After a pick 6, the score would have been 15 - 7 if they make the extra point. At that point, it's anybody's ballgame.
Being down only 8 could have changed the mood on LSU's team and definitely would have changed the momentum. Who knows what would have happened?
Keep coming up with reasons to make yourself feel better as to why the game was still in doubt even though 'Bama dominated for much of the night.