You left out the most important part of 2013's decisive advantage...........A COMPETENT AND PROVEN OFFENSIVE COORDINATOR. GAME/SET/MATCH
As much as I hate using all caps, I gotta agree with this statement.
And to the OP, if AJ90 lives up to his talent this season and ego keeps improving in the offseason, then the DT's could very well be as good as 2011.
However, it's hard to get better at the DE position with Montgomery and mingo. Don't get me wrong though, I'm confident in this year's D-line and I'm sure they'll do great.