RB has other known victims who are alive though. What makes MB different from them for him to have potentially killed her?
You have a point there. The way I see it is that as he is a resident of Australia where his family and friends are, he would have wanted to protect his reputation back home in case he was found out. So IMO his MO was to arrange for these women to disappear overseas by paying someone else to do that task while he could prove that he wasn't in that country at the time.
That's why I think MB met her demise overseas at the hands of someone else. He flew back earlier so there is proof life that she was still in the UK after he left with the phone call to Sally a few days after he left and also the postcards - the last one arriving on August 30. .
With JO, he hoped she'd be stranded overseas as she had no money while he sold her house and had it in his name. Yes there would have been a court case later but he would have argued that she willingly signed the house over to him. Perhaps the travel agent whom he told her to go to was his accomplice who had the task of making JO disappear but luckily she went to her cousin's place for help. Did RB know that beforehand? I've forgotten now. But JO's demise would have occurred overseas while he was back here in Australia.
With GGB, his main goal was also to get her overseas to Paris where she could have met her demise but she didn't fall for it.
With GD, it looks as if she could have met her demise in Bali where her family would have found it very difficult to find out what happened to her. But again, he probably would have flown back to Australia before she died, the hitman would have been tasked with giving proof of life after he left with phone calls and postcards.
Keeping MB alive by giving her a passport in another name whether legally or illegally, does not prevent her from reporting him to authorities as being the one who probably defrauded her when she found out that someone had emptied her bank account whatever country she could have ended up in. Even if she willingly came back here and naively gave the money to him herself, when her dreams of being married in Luxembourg didn't eventuate and he abandoned her, she would have reported him.
Yes MB knew him under another name but she would have known enough about him to describe his appearance, his age, the area in which he lived in Australia and that he came from Luxembourg. Not sure if he would have told her he was born in Belgium. If he had shown her his FNR driving licence, the police would have tried to trace that to a Remakel living in Australia. But there was no one under that name living here so it would have led to FNR living in Luxembourg whom RB would have hoped would be suspected until his appearance didn't match the description MB gave. So police would have been alerted to a resident of Australia using FNR's name. Further searches would have then been done (as Joni did) and the ad would have been found. And the rest is history.