Some more far stretched coaching candidates who haven't been mentioned to go with Edgar Bennett. I'm on the fence about all of these, but reading some articles left and right, they could be in consideration as head coaches for quite a few teams.
Don Martindale (DC Baltimore, 55): He's doing some amazing stuff with that Ravens defense this year, but also had the worst defense in the entire season in 2010 in Denver.
Gus Bradley (DC LAC, 52): Helped build that Seahawks defense from 2009 - 2012, before putting up an abysmal 14-48 record with Jacksonville as a head coach, only to come back and work wonders on that Chargers defense.
Matt LaFleur (OC Tennessee, 39): Was the OC for the Rams under McVay. Left for Tennessee this year so he could start calling the plays (McVay called plays for the Rams). Journalists keep raving about his "sharp mind", but that hasn't translated to great results or improvement for the Titans so far.
Jim Schwartz (DC Philadelphia, 52): I'm warming up to the idea of Schwartz. He did amazing things in Tennessee, inhereted a 0-16 Lions team which he got the play-offs at 10-6 just 3 years later and turned around that Eagles defense from one of the worst to a pretty respectable unit in just one year. The only big problem is that he runs a 4-3 and most likely wants the kind of control over the defense that keeping Pettine around won't be an option.