I'm not enamored with Glenn bringing in the same defense and it's part of why I have him after the OCs. But he has done a good job running it in Detroit and maybe he has some tweaks that do make it work against modern offenses. I do think he will get instant respect from the team as a good former NFL player that has run a good defense in Detriot.
I would just prefer an offensive coach who is going to bring a more aggressive and exciting form of offense and hopefully the same on defense. But Glenn could end up being that guy and he might hire an OC who is that guy.
And there was a time when DA used to blitz out of this scheme, he just seemed to get more and more passive and rely on coverage too much as the years went on. Maybe the pressure of being a HC made him just not want to give up big plays and he lost his aggression?