What I don't understand is how such a distinctive vessel disappeared. I agree that ignoring all those sightings was madness, but where did it go after the last recorded sighting? I'm sure that wherever it went, in any circumstances, people would notice it, which makes it a strange choice of craft for an abduction.
In part 3 of the video I posted the Ketch is sighted around NZ coastal waters for a few months after January 1998.
https://www.youtube.com/watch?v=wJoW6qhHmn8I don't think those involved (the yaught's crew) had intended to carry out an abduction.
I think they attended the partying at the lodge, and coerced Olivia Hope to go on board with Ben Smart, Not sure if they were actually a couple.
My reading of it, is that it was probably gang related, the crew running drugs to various drop off points. Olivia Hope is coerced on board for sexual gratification, or whilst on board she & Ben Smart notice something they shouldn't have.
Then the crew & or gang involved spend a few days working out what to do with them.
The so called cell mate confessions which were later discredited, could have been disclosed by members in the know of the particular gang, whilst in jail.
Here's an easier to watch video than what I've posted above.
https://www.youtube.com/watch?v=IbTmVwxQIkM