I for one learned far more in a Sim while sitting at the Instructor's console than I ever did in one of the two front seats. Mind you when I slid my seat up with all that clackety-clacking racket....I usually had something germane to say. How it was received was directly proportionate to the desire of the folks up front to learn.
The most effective learning tool was a video replay....over coffee and only the "crew" present. Most times....with anyone with the IQ of a dull third grader, nothing much was needed to be said. The next Sim session was much more productive as some barriers to learning had been removed.