I can’t remember if this has been asked, but any chance Amy never left that ship? There are cases where people speculate certain missing individuals never left the location in which they were last seen. For example, Brin Shaffer.
I don’t see how it could be, but what do you think?
If we agree she wasn’t left on the boat, she left somehow. Willingly? I don’t think so, but it can’t be dismissed. Unwillingly? How? In a suitcase or box? And then what? If she sex trafficked, all these years later no proven sittings? No customers recognized her? She never had an opportunity to say she needed help? If she was deceased, what happened to her body? If someone accidentally or purposely killed her on the ship, what would be the easiest way to get rid of her? Not trying to take her off the ship, IMO.