Funny. I was thinking the exact same thing today. THIS is the $64,000 Question,
@Meligator. Maybe the key to everything. How does Marion's story fit JO's?
Here's my take: the big idea was to have the Australian money available to Marion in Europe. Candy from a babe. Not documents but nice, cold hard cash. The Big Sting. That way, RB could propose a school to buy or a yacht to sail the Mediterraena, or a newlywed house in Luxembourg to buy with Marion's ready cash. (While his is tied up in some other legal venture, he explains. . .) RB will takes the money, vanish, and Marion is left with nothing and no legal means of going after RB.
[ So the Barclay's is aligned with the Australian bank, so the idea is Marion could have withdrawn all her money through Barclay's.]
So, Marion changes her name, as suggested, it's all good! He's got her in Europe where he wants her. Now he can tell her there's an amazing deal to purchase, they need the cash for the deal. BUT a hiccup. Marion can't withdraw her Australian funds from the Barclays as RB had planned. Either there is a limit on withdrawals or the new name has screwed things. RB is angry at Marion, and the patina begins to wear off. RB tells Marion she must return to Australia to withdraw the funds immediately or they'll miss the big deal! Marion complies. Arrives in Australia to withdraw funds or set straight the bank setup so she can withdraw from Europe, planning it will take days -- BUT she can't arrange it. Either the name change has screwed up the banking situation or the way she deposited the money in the high-earning account. Marion's (really RB's) only option is slow withdrawals. Time drags by. RB waiting and waiting to get his hands on all the $$.
Meantime, Marion begins to weary of the whole thing. She' runs a few errands. Tries to kill time. She's alone, handing money over to a man who is increasingly impatient and cruel, and she begins to doubt everything. Who does she call? She has no one to share this horrible situation with. Where to begin?
And meantime, RB knows he's screwed up. He didn't think of everything. Now Marion's back in Australia where he doesn't really want her. Of course, he can't blame himself, so he blames Marion. It's a perfect storm once he has the money. Or maybe just part of the money. Perhaps the charade of a fake Marion does happen but it's after she's dead and RB can't resist draining out every last penny. His wife is called in to perform, and she does.