Such as?
Why I said "On the first look at it it doesn't look good, but there could still be an alternative explanation" was because I believe there are alternative explanations. I was working on the idea in the thread ""both Kate and Gerry have both publicly contested the alerts to cadaver" T/F?"
http://miscarriageofjustice.co/index.php?topic=9281.0, for IMO Kate and Gerry never say there were no cadaver alerts in those places, but they do say it wasn't Madeleine.
If someone showed me a clear denial of the cadaver dog alerts by the McCanns I might have reconsidered, but the nearest we got to a denial was that "cadaver dogs are unreliable" by Gerry or Kate's "unconscious cuing" excuse.
So I looked for other reasons they could be aware of a cadaver odour source that wasn't Madeleine.
I don't go along with deceased piglets brought into the apartment. To me no one has really eliminated the possibility that there had been another death of someone else, the body being held temporarily in the apartment.
Amaral tried to show no one else had died prior to the 3rd, but he did not show no one else died on the night of the 3rd. Particularly the demise of another child, small enough to be hidden in the sports bag.
OK the question then becomes "when could they have first been aware of this"?