I really enjoyed Wade Phillips scheme back in the day, but didn't McVay (LaFleur very good friend) fire him because he wouldn't adjust his scheme? I think Phillips NFL career is done, he had the perfect setup with the Rams... and Packers don't currently have the DL nor CBs for his scheme.
Other options
Jerry Gray (Packers defensive backs coach)
Mike Smith (Packers outside linebackers coach)
Kris Richard, former Seahawks DC.
Jerod Mayo, Patriots star ILB turned defensive coach. And while former Patriots head coaches have not faired well, former Patriots turned defensive coordinators have down pretty well.
Marvin Lewis, did great with what he was given, even if the Bengals GM was completely shitty at his job (Bengals GM is their owner)
Stephen Belichick, Bill's son and has basically coached all over the defense.
Teryl Austin was the coordinator of some good Lions defenses between 2014 and 2018. He's been a top assistant for the Steelers defense the last two seasons and could be ready for a return to leading a defense.
I think I'd prefer someone from the Vic Fangio or Belichick coaching trees.
No idea, where LaFleur will go with this one. I was kinda hoping the Broncos or Titans would fire their head coaches should we need a new DC and try to hire them, etc.