In the two cases you mention, were the victims American? Amy is/was a beautiful young woman. What motive would the perp (s) have to abduct an American young woman off a ship to be used as a drug mule or to work in a factory? I know you don't believe it was prostitution or sex slavery but to me, that would be the only scenario that would make any sense.
This is wiki and I apologize if the information is not 100% accurate but it gives us a quick overview of human trafficking and what countries are mostly effected. If I have time this evening, I will look at more accurate statistics. It appears third world countries are most effected.
I think it's not impossible to believe a perp grabbed Amy on the ship for sexual purposes and threw her overboard after he had done the deed. IMO, it makes the most logical sense.
I understand and respect the family's hope she is still alive and the sightings do give credence that she may be still be alive but is it realistic to think all these sightings including the one in San Francisco are 100% accurate?
In Madeleine McCann's case, there have been perhaps hundreds of sightings of her all over the world including the US. None panned out. People with very good intentions see someone resembling the victim and call in the lead but many times that's all it is. A look alike. A false lead.
Anyway, just my 2 cents worth.
Human trafficking - Wikipedia, the free encyclopedia
If there is a Canadian connection as alluded to in an earlier post, if you can provide us with more information that would be greatly appreciated. IIRC, it was the Venezuela "fake" escort service (??). Perhaps we can do some sleuthing on this side of the border.