Rex is a study in contradiction. He is simply not a head coach in terms of his skill set and he's proven this time and time again. But as a DC, he has some value. His problem though is his ego, which does not accept and or recognize where his strengths and weaknesses are. He will be looking for an HC gig because he thinks he's a great head coach. And some dumb pathetic desperate franchise will probably give him the chance to do it all over again. And he will then make the same mistakes. Because there's one thing I know about Rex, and that is he makes the same mistakes over and over again.
He's an immature man.