Hindsight is 20/20.
1. The Kaufusi move to LB was bad. (I actually see the rationale to do it though and it is hard to fault them too much.) It seems clear he needs to transition back.
2. We have 10 coaches. By Bronco moving to help the offense (OL) we had 6 of the 10 coaches on Offense. That left 4 coaches for the Defense (not to mention that Poppinga had Special teams). So 6 coaches on Offense and 4 for Def/Special teams. It seems clear that the D coaches were spread way too thin.
It seems clear that Bronco needs to go back to helping the D (and perhaps somebody like Coach Holliday or Atuaia on the O needs to take Special teams, or if Bronco isn't going to take over the D then maybe he needs to take the special teams for himself).
(FTR, I would probably be considered in the Pro-Bronco camp because firing Bronco right now looks completely insane to me.)