So yeah, IMOO, I think the strongest evidence they have of placing MB in the same vicinity as RB, at the time she disappeared, is the string of ‘proof of life’ incidents: (1) returning passport, (2) passenger card in MB’s handwriting, (3) car membership cancellation, (4) optometrist visit/medicare card, and (5) a series of bank withdrawals, including $80k from her regular bank - the same bank where she created her mortgage 3 years earlier, and ended her mortgage just 5 months earlier, so they knew her and would be able to accurately ID her.
IMOO, the story being that MB returned to Oz to see her family and prepare for her permanent move overseas with RB, because that’s what he told her. However, after withdrawing her money, MB didn’t make it out of the country because RB was never going to move overseas with her, because it was a scam. MB also never made it to see her family, because RB couldn’t let that happen.
As per his pattern of behaviour, RB usually disappears from his victims lives after taking their money. This time he was unable to disappear because MB knew his phone number and place of residence. RB admits MB called his home several times, and admits MB knew his address due to sending her boxes there and even visiting his Wollingbar home. Therefore, this time, RB was unable to disconnect from his scam victim, so he took her money and made MB disappear instead.
Another motive for RB disappearing MB, was that she had a connection to two former scam victims. If kept alive, MB could report RB to police, who would reach out to the real Remakel in Luxembourg (like podcast did), who would realise his ID was stolen and give an opportunity for MC to tell police about her experience with RB, including revealing his addresses during the years they wrote to each other.
Do I think this is exactly what happened, no. But I’ll be happy if it goes on record that RB is likely involved the disappearance of MB.