So ... is there any other non-abduction scenario to consider? Were there any other times that night when one parent was alone with Maddie? Well gosh and begora, there WAS: From 9 to 9:30 pm when Gerry was checking on Maddie, and might have had access to a man with a car (Russell O'Brien was also missing from the table for part of that time). This scenario doesn't require a 2-hour long acting job by both parents. In fact it doesn't require a acting job at all, for one of them.
Becasue KM decided it was safe to leave the twins to alert the others. No screaming or hystaria to bring others to her. They tried to lie about the distance to the Tapas for a reason. They have lied about the checks for a reason. They have lied about the timeline for a reason.
They also deemed the resort safe enough to leave them again to travel.
To me this does not add up.