One thing that I cannot get my head around re: the conman theory is, why even have Marion travel to the UK at all? If the plan all along was to isolate Marion, and/or marry her, and then return to Australia to obtain the money, it would have been much, MUCH easier to lead her family to believe that she was going to England, say that she wasn't going to be able to be in contact for a while, and then kill her/have her withdraw money under duress whilst she was still IN Australia.
I feel like I'm not articulating my thoughts very well, but throwing another country into the mix just seems risky and unnecessary. Sure, it provides the possibility of sending a few postcards confirming her whereabouts as abroad which maybe bought some time, but it also adds so much HASSLE that makes very little sense to me in terms of a professional job.
Even if the plan was to get her out of the country and marry her there so that records would be harder to trace, why go through the process of marrying her at all? As far as we can tell, that angle provided no actual help for a third party. It's not as if they wanted to collect life insurance that they wouldn't be able to obtain otherwise, or have her assets transferred into their name. It makes no sense. Even if it was just to lure Marion into a false sense of security, that could have been achieved by other means with fewer stakes WITHIN Australia.
Cleaner. Less mess. Less of a paper trail. Less hopping about across international borders praying no one's identity gets flagged.
I have no idea what my actual point is. I just can't see the makings of an overarching scheme that makes sense.
(I'm not dismissing the conman theory, in fact it seems like one of the most plausible imho, but the whole England trip seems BIZARRE to me).
If anyone has any thought that might help my confusion, feel free to let me know.