I have no doubt that Tony Romo understands offensive football better than Scott Linehan, and Sean Lee understands it better than Rod Marinelli.
In fact, I'd bet Romo knows defense better than Marinelli, too. It's what makes QBs like him so effective.
It has to happen all the time. A guy like Baker isn't responsible for just Sean Lee on a given play, and he probably is looking at every position *but* Sean's most of the time, knowing Sean will have his assignments right and when he's playing next to a young developing player like Jaylon Smith. Of course there will be times when the player diagnoses things that are affecting him faster than a coach would. When that happens and there's a camera on it, the coach is going to look like an idiot.
Really, though, it's a process like any other. You get player feedback, you get whatever still or video images are available on the sidelines these days, and you go back and forth figuring out how to adjust on the fly. You see a segment of that process in a film designed to make Sean Lee look smart and like the hard worker he is (remember how they ended the show itself), and it's off to the races.
In general, though, AorN didn't really show a lot of technical coaching going on in any of the position group sessions. That was for a reason. They show the funny clips like Marinelli's wild animal stuff, and they show the pre-meeting stuff like the Eminem video that references Dez. They show a few things from inside the meetings themselves--like Dez' dust-up re: the Bronco secondary, but no actual football content to speak of. It's a mistake to assume that, just because we've now seen a few minutes of footage inside the position group rooms, we really have seen anything at all in terms of the actually position group coaching that's going on. It's the same phenomenon we had where people thought because all they saw of Garrett was what he showed in a press conference that that's how he also interacted with the team. It's generalizing from too little information.