The scenario doesn't make sense because she would not have gone on vacation with him willingly, imo
*Snipped for space*
This stuck out when Mysteriew theorized that he may have somehow coerced her into getting on a plane with him. I thought of something. Think about this... Stacey tells him she wants a divorce. He begs her to stay, he promises her that he'll try harder, he'll do anything, etc... On the fly, he tells her that they should pack now, go away together to Jamaica. Leave tonight. "We need to be alone, I love you, I want to make this work".
As soon as I heard him say 'Bikini' and 'Jamaica'... that was my immediate thought.