I don’t think any of the coaches should be fired. I also don’t think their shortcomings should be ignored. They all need to up their development game.
Development isn't the issue.
Talent is.
The OL doesn't have issues with guys who aren't developing. Their interior is made up 2 guys with incomplete skillsets and a center who is undersized and always will be.
WR is woefully short on numbers, experience and talent. When you are relying on a freshman walk-on LAX player to turn in major reps, you know things are bad.
DL has impressed, namely DT. Cross and Mills have been two of the most productive DT's in the country. Edge hasn't been as good as some hoped, but that's more a talent/experience issue. Botelho isn't a fit at Vyper and the guys behind him are just starting out at Vyper. Meanwhile, JJB has been good, but there's not much behind him in terms of quality pass rushing at big end.
LB hasn't been perfect, but they've produced. JD, Marist and Kiser have been very productive and have helped this unit be one of the top units in the country. Sneed has progressed and is coming off his best game vs. USC.
Corners are elite. Safeties, in spite of the heat they get, have been mostly solid. Watts is budding into an elite safety, while Brown and Henderson have been mostly solid. Safety's issue is talent, as this unit would likely benefit from a guy like Downs or Bowen. But those were outside of the staff's control.