Sombody ever read that reporting?
The jaw-dropping footage of sniffer dogs alerting in McCann apartment and car – The Cadaver Dog Network
If the location of the scents can be confirmed, i would likely tend to a foreign contamination by the intruder. Entering near the flower bed, maybe spent time there lurking around, not to be seen from the lightened street and avoiding a noiseful gate? Maybe hiding in the parents room between the checks or MM had been there, and exiting through the window behind the sofa. Maybe the abductor or the victim had been hurt, due to the blood trace?!
If hidden in the parents closet for a while, could he have contaminated GM's and KM's clothes?
Maybe the abductor never had to enter the childrens room because maddie went to the parents bedroom and had been snatched there? So the abductor chose to leave the apartment by not using the way, the parents used to check for the kids. IMO he could leave through the front door, without being suspiciuos.
The trace behind the sofa could result from a former visit to check the scene and look for possible exits for the next visit? Same perp, same trace?!
There is already a connection to cadaver smell and CB in Neuwegersleben. Who knews, what he did over the day in PDL?! He is known for strong odeur, isn't he?!