I have noticed that the majority of the scenarios here suggest a lying RT an involved RT, Barbara was never there scenarios, and/or red flags about nearly everything RT has said (kidnapped, carrying a beer, love of his live etc) and RT and BT have done (dog, kennel, hiking prior to China trip, beer, bikini, writing/keeping love notes), and assumptions about RT (did not want her to go to China etc).
It may be common to let your mind go over the person who saw her last, even more if his words are the only thing you can work with, but why not thinking up scenarios in which one goes by the presumption he is telling the truth, and see where that thought leads to?
He may after all just be telling the truth about everything, at least I believe so.
Why not take it up for this man who's wife disappeared, rather then casting doubt on his every word and move? Just wondering.