My thoughts on this.
Ron Rivera cut his teeth as a defensive player with the Bears in the 46 defense.
He coached LBs under Jim Johnson with an attacking 43 blitz scheme.
He was the DC for the Bears in a cover two, a defense that took that team to a SB.
He took over as DC midseason on a Chargers 34 defense that lost it's best player at the start of the season, and yet revitalized that defense after taking over.
This guy has shown he can get players to achieve, and has shown he has unmatched flexibility when it comes to scheme.
He might be my top choice next to Jim Shwartz.
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