Well thought out post and succinctly put, Lordpookles.
What are your 'armchair detective' thoughts as to why professional parents would endanger themselves by attempting to cover up an accident? Why not micromanage the scene starting by at least trying to make it look like a forced entry.
I doubt I would make a false claim of that nature without making sure the basics were in place to substantiate it.
Yep I've read some of your views on that and I think differently on that point. If you murdered someone and decided to stage the scene - would you go too far thereby leaving potentially more forensics and clues, which could implicate yourself or do as little as possible? My view is for the latter.
Another case, which i was interested in was the Amanda Knox case. As we all know she has been exonerated. I don't know if she was involved, but imo there was a helluva lot more evidence then in this case. There was a body for a start and lots of forensics. Anyway, it appeared as if the scene had been staged, because a rock was found inside the house. Apparently used to smash a window, which looked like it had been placed there because it was on top of all the other debris in the room, which had been trashed like it was a robbery. Small details like this, which would be apparent to a professional eye, but the perpetrator would be oblivious to their mistakes... saying all that the parents if involved and being ordinary citizens and perhaps not having an interest in crime would go too far with staging the scene as would most imo. IMO, it looks like someone has been in and out of that apartment very fast and my own theory is that the missing child may have been lured to the window and they never even entered.