more Jinx talk: I dunno, I'm not an industry insider like you are. Is it customary for a small documentary crew to immediately listen to every minute of stray audio that was recorded when nothing was being shot? When the editors are sitting at the bay, do they usually say "okay we've got the shot we wanted, but let's keep watching this footage of an empty room just in case something dramatic happened when no one was paying attention"?
I agree that -- in terms of the case -- the "confession" is not all that revelatory and even if admitted in court, will be torn to shreds by the defense. But for dramatic impact, it's a hell of a closing note.
Again, I don't recall Jarecki claiming to be neutral. He wanted to give that appearance to Durst as much as could so as to make him more comfortable, but let's not forget he had previously made a fictionalized account condemning a thinly-veiled Durst stand-in.