Why is Ron Rivera better than Mangini or Marinelli or the other hires?
Rivera coached LBs under a defensive mastermind [Jim Johnson] who admittedly viewed the LB position as least important of the units. He then went to work for Lovie Smith who undoubtedly elicited significant influence on the Bears defense.
I'm not saying Rivera isn't going to be a good head coach, but how he rates higher than Mangini, who was not only from the Patriots family tree, but was the Browns and Dolphins number 1 choice last year to be their defensive coordinator or Marinelli who has been a mainstay on one of the NFL's best defensive units is beyond me.