Fire Dennis Allen!!
It's time. He needs to go. Whatever it takes. A lot of us have been screaming this for 2 seasons now.
He got his preferred QB. Didn't change anything.
He got his preferred OC. Didn't change anything.
Part of building a competent team is having depth at key positions. Injuries are no excuse. If the backups are a huge dropoff that is also on the coach/FO.
Even the most basic football fan knows games are won in the trenches, but Allen and Co have allowed our O line and D line to deteriorate to the point of having a completely broken team on both sides of the ball. This is football 101 and totally unacceptable.
As others have said, if the defense isn't good then what is the point of him?
Also, go check last years defense. they also weren't that good, but had the advantage of playing against many backup QB's and really bad offenses.
I think he can easily find a job as a DC somewhere so he can still make a living. He will be fine.