Yeah, you do need youth on the D side. But you can't tell me that their biggest issue is your Defense. I amend, and say ya'll need wide outs and O line.
They did a good job in the superbowl, but they pass protect, double well, pick up blitzes well, but don't pull guards or run block that well. Same scheme as the Niners, small splits and timely double team with a moble QB. It was a matter of match ups with the Panthers in the superbowl.
Your Running backs are pretty good at picking up blitzes too. I think you'll find that Faulk is a more dynamic back in the long run. Neither he nor Dillon are game breakers, but then again, the Pat's didn't need it.