I don't think this team is in a rebuild at all. The defense needs a NT and a CB and it should be top 5. Hell, it should be at least top 10 now, but yeah...
I think Tomlin is very intelligent. He brings in sheep coordinators because he knows he will never be challenged, and they will never be able to take his job. When things go well, Tomlin had his hands in everything. When they go poorly, he has a fall guy. It's brilliant. When he fires coordinators, he's actually firing himself.
I'm with you. This roster has talent. It's by no stretch of the imagination perfect, but with how this team is set up right now, if the offense can put up 21 points in a game, the defense should be able to win the team the game. They aren't even coming close.