Whoever has access to the advanced stats, please tell us what this defense does well.
I think the problem is this defense is mostly a lead protection defense, or at least that's how I'm feeling it. When our offense is on fire and opponents can't rely on the run as much and have to press the issue, defense can do well. But when the offense isn't doing well and opponents can methodically mix the run and the pass and grind on us like we saw last week, they can't be counted on to turn momentum and get turnovers. That's where I see problems.
Now, I'm not sure what things will look like in the playoffs. Assuming we don't face SF on the road, and even a possibility TB gets knocked out by someone else before we'd have to face them, could be our offense gets a favorable path to the nfccg again. But.... There will most certainly be prolific offenses we gotta play against. New Orleans, though we beat them the first time would have Michael Thomas back this time. And of course Seattle who yes we've beaten here in Lambeau in the past, but the way they're playing this year it's going to be hard to make sure we'd get them here, especially since we don't get to play them on our schedule.
All that to say I think we're going to have to replace Pettine especially if the defense can't get it done in the playoffs, which right now it's not looking like they will.
Who do we replace him with?
Well I understand why Zimmer is a favorable choice, but I doubt that'll happen because...
1. Chances he gets fired in Minny are extremely low even with the season they are having. Likely won't be out until next year.
2. Even if he did get fired, teams like the NYJs and DET would be jumping up and down to hire him as their HC with Gase and Patricia guaranteed to be fired at the end of the year, and no way Zimmer will turn down a HC job for a DC job. NONE
Now... While also a low chance probably, if Vic Fangio gets fired, I'd say go for him as his DC track record has been pretty good.
Ultimately, we may need to find our own Matt LaFleur of the defense kind of guy who has new ideas and doesn't just stick to the old philosophies that a lot of these retreads stick to.