Did you watch the game and appreciate the circumstances? LSU had no secondary, they were down two of the guys from when they played Alabama and the secondary was really bad that game (Mac had 385 yards and 4 TDs).
So, what LSU did was not rely on their secondary to make plays, they forced Trask's hand. That resulted in 4 punts and 3 turnovers, and remember the LSU offense wasn't holding the ball like Alabama was. So what LSU did was with a much, much, much, much worse secondary, they held Trask to a 66.5 QBR. They held Florida to 34, meanwhile Alabama gave up 46 on a 91.4 QBR. To reiterate, this was with LSU playing fourth stringers on their secondary!
They have tons of talent on offense and every offense Alabama has played with a pulse has put up points.