LSU quarterback Zach Mettenberger made a solemn promise just as 2012 was giving way to 2013 early Tuesday morning. He was trying to explain the inexplicable -- how the Tigers could be so dysfunctional offensively in a 25-24 Chick-fil-A Bowl loss to Clemson that included a lot of the same warts that have popped up in LSU’s other losses over the last couple of years. “Trust me when I say this is going to eat at everybody on this offense all year and all offseason,” Mettenberger said. “You’re going to see a totally different animal next year. “We’re going to get this right for next year.” They better, particularly if they plan on keeping pace with Alabama in the Western Division and remaining a fixture in the national championship equation.