Lack of a front four pass rush starts the ball rolling on this one.
Again, as I said in another thread - a secondary that is as suspect as Verbal Kent doesn't help matters at all, but if your front four isn't getting any push to pressure or sack QBs, then you could have Deion Sanders, Darryl Green, Rod Woodson, and Ronnie Lott out there, and it wouldn't matter.
No secondary can cover anybody with as much time as this D line is giving them.
The funny thing is when the blitz is called. Doesn't get there. At all.