I don't even think we hire a replacement. We basically just hired a 2nd d-coordinator.
I also don't hate rob ryan as much as everyone else. The guys legit had some of the least talented units in football for the past 10 years. Bad year last year. They also had 1 guy to rush the passer, a safety who eats a ton of cap and doesn't want to play, and a corner they vastly overpaid for who's just not good. Their GM has always been solid in the draft, but his free agent signings are a mess and they missed junior galette.
Before that - Dallas. Year 1 - Sean lee in the middle, 2 solid pass rushers, pretty solid D. Year 2 - no sean lee/spencer, new prized corner (Claiborne - who turned out to be a bust), and they sucked.
I don't remember those mangini cleveland teams, and knowing who was in charge in Oakland i don't think we need to look back to see that they all probably sucked.
He also could totally flame out, i have no clue. But if it makes Rex a better coach, and we ARE stuck with rex. Bring him on.