I think they placed her body somewhere after she died, then when the search got too close to the hidig place, one (or both) of the parents used the rental car to move her body somewhere else.
If the McCanns were being so closely watched, how could they have gotten away with this? I haven't read this whole thread yet, so the answers to some of these questions may be here.
1. If the Brit cadaver dogs are so remarkable, why can't they locate a) the temporary "hiding" place of Madeleine's body and b) where the body is laid to rest?
2. I understand the roads near the church the family prayed at will be dug up. What is the point if they were being so closely watched?
3. Highly unlikely, but possible the rental car was rented by the actual abductor (not being the McCann's)
4. First I read the bodily fluids were 80%, what about the other 20%?
5. If the PJ is trying to frame the McCanns, perhaps this is what happened. Though it may be far fetched, here is my idea. The dogs are given a scent to pick up on. Supposedly, they are given a cadaver scent. Who is to say they weren't just given the scent of Madeleine? And that the PJ is being untruthful and just saying they were given the cadaver scent?
6. Perhaps many of the forensics are made up. Money talks.
7. I just cannot believe these parents had anything to do with their child's disappearance.
8. Sadly, I do not think Madeleine will be found alive.