I have put out a theory Stephen.
Let's see yours
Your 'theory' as you call it sadie, is merely a flight of fancy, i.e. speculation.
There is no evidence of abduction.
If you have read between the lines, you know what I believe happened, but as is clear, the forensic evidence is inconclusive, as to whether it indicated a dead body or not. Inconclusive means precisely that. No proof either way.
My suspicions of the parents behaviour stem from early on, when they stayed in the apartment on the night of Madeleine's disappearance, rather than search for her. As a parent it would be the first thing I would do, not hiding away in the apartment til the following morning.
I can expect the response to that latter point, is they 'did search'. Well that is countermanded by the Jane Hill interview amongst others.many other people did on that night; local people,police holidaymakers, ex-pats. Also, they continued to search not just that night, but on subsequent days.
That is where my questioning of their behaviour started, but there is more.............................