Lightweight is good. Errors and holes aren't. What do you think is the single biggest error/hole in MWT's theory?
If I have got this correct ...
1) Madeleine wakes and wanders. Please note, I consider this possible, but improbable.
2) An opportunistic predator in Luz sees Madeleine and snatches her. On this point, I am in disbelief. It is simply that, everything would point to Madeleine heading downhill the short distance to the Tapas area, with which she was familiar (high tea, playtime and pool) OR taking the shortcut to the Mini Club in Ocean Club reception, where she spent most of her time. Both journeys are short, so this opportunistic predator had to be faster than the Flash.
3) On top of 1 and 2 we have to have staging. The possibility of staging exists, so I am not ruling it out.
However, we now have low probability 1 x low probability 2 x low probability 3. Not impossible, but there are more likely scenarios.
I haven't reread the entire thread, but if MWT is the one who had the dogs going totally the wrong way in support of his theory, then I think his credibility as an 'expert' on the case is holed below the waterline about as badly as the Titanic was.