What Diggs said hinted that we have a problem with coaches on defense side of the ball, and some players too of course, but mainly at the coaching level.
We have a first time DC but Pete also hired a more qualified coach as his equal? Or, as his subordinate? Or, as his mentor? Mentor should be out as they are around the same age. When there are two bosses, often ended up as having none, which is sounding like the case. Players are playing with no discipline, and lacking abilities to execute and coordinating fundamental stuffs.
I speculate that Clint Hurtt and Sean Desai aren't on same page, I further suspect Clint is mainly handling the DL, Sean with DB, LB is a gray area that both putting conflicting influence on. With these two wrestling for whatever they are wrestling for, the players are getting conflicted instructions, which led to poor coordination on the field.
I suspect that Pete was trying to hands off and let Clint and Sean so it, but he put the wrong structure, all these might end up Pete taking over yet again, which will piss Sean off. If we hired Donahue, it would have worked better, but we somehow hired Sean AND Hurtt.