Sadly, we currently have the 7th most expensive defense in the NFL (per Spotrac). We started the season off on a high note, creating turnovers almost at will, creating pressure off the snap, etc.  However as of late, it seems like our guys are out of position, not communicating like we did in the beginning of the season, missing a plethora of tackles per game, etc.
 Here are a few of my observations:  
1) Although we've shown spurts of playing like a top tier unit, we've regressed drastically. 
2) Are the players failing to communicate pre-snap, resulting in blown coverages, losing containment in gap control, etc.
3) Missed tackles is also becoming a bigger problem game in and game out.
4) Personally, I was never a fan of switching to a 3-4 scheme. I just don't think we have the necessary players to implement the scheme.


CONCLUSION:
I believe we should try everything schematically, mix in a lot of 4-3 looks, allow our prize book-ends, both Allen and Walker, to get after the QB like they were initially drafted to do. 
If we continue this trajectory of getting gashed week in and week out, then Mike Caldwell should get his walking papers, the sooner the better.
Your thoughts

---