I was with you until this part:
Yes he will be, if you watch the games Butler will sometimes huddle with the defense and go over things and also DL will give him the play to call if you watch closely. Look like he's training to me.
I've seen him on ESPN a couple time with Skip Bayless and the loud obnoxious guy and the torture they put him through might be the most entertaining thing on ESPN outside of those E60s which are awesome. Those 2 guys just torture Mangini. You can just see him dying inside on that show. Skip and Bobo have no idea what they're talking about, Mangini clearly knows it and he just seems so troubled by putting on a happy face and taking part in a discussion he looks like he thinks is the dumbest discussion in the world but it's paying the bills. He's nice about it, but doesn't seem happy.
Maybe he's holding out for another HC gig? But he seems like a guy that's too good to be wasting away on ESPN. ESPN seems like a good home for guys like Herm Edwards or Brian Billick.
Keep in mind that if you promote him to DC, he will not have the time to concentrate on the job that he has done so well, coaching up the DBs, because he will be too busy with the D as a whole, which is a job that I also don't think that he is ready for.
We will see the same effect on the OL in another year or two because of the investment we made over the past three years in Pouncey, Gilbert, DeCastro and Adams (maybe add Beachum in there).