Are you perhaps an editor yourself, or work in that field somehow? I can see on a technical level what you say makes sense in terms of editing. BTW, D'Amboise was very complimentary about Knopf and his editor (one can see that on the acknowledgment page of his book too).
On Tuesday night these subjects were touched upon. He was quite definite that he was not very interested in his movie career. He implied he could have done more of it, but consciously choose not to. He said he strongly disliked the "culture" found in movie making -- he even told a story of how he went to a 9am call at 7am in order to "warm up" and be ready to "go on stage" as it were, but that it was 9:15am before anyone else even showed up and that was some stage hand casually drinking coffee and eating a donut!. He made it quite clear this lack of discipline was not his cup of tea. He touched on the "head of City Ballet after Balanchine" issue too. He was less definite about that. But he clearly indicated that he didn't think he was the "right" person to do that job, that he had no regrets (he strongly said that), and that his true inspiration at that time came from envisioning a future teaching children to dance and to love the arts. Judging from how he relished his role that night as a sort of "teacher" to we, the audience in the room, I think it was clear to all of us, just how much he indeed loves teaching.
There is also some ambivalence about what d'Amboise really wanted in his career, regarding making movies for example, and whether he really wanted to be head of City Ballet after Balanchine.