And then to follow that with whatever track they discover, and the parents say well "I took that path with Madeleine earlier", one is none the wiser. If Madeleine had run around apartment 5 earlier we will never know if the tracker dogs were tracking this or her "final passage" around the building being carried by an abductor.
It would only come into its own if the tracking dogs took their handlers on a path that Madeleine was unlikely to have taken previously.
The explanation by her father was forthcoming after the dogs followed that route. Her mother, as far as I know, has never mentioned the tracking at all except to imply the blanket was handed over later than it was. Perhaps she wasn't there when the children ran away? Gerry doesn't exactly say, he just says 'they';
That, between Monday and Wednesday, not knowing the precise date, when they left the residence by the main door, to place the children in the respective creches, MADELEINE left [went] running to the left to the extreme opposite of the residential blocks where they were lodged, playing with the twins. That they had gone down to the furthest point away from those blocks, not knowing exactly how, the three children got into the gardens at the rear [of the blocks]. Then they followed the inside corridor [pathway] at the rear, next to the hedges [fences] up to the street that led to the secondary reception.
http://www.mccannpjfiles.co.uk/PJ/GERRY-MCCANN-10MAY.htmOn all three days MM was delivered to creche in the mornings by her father, as were the twins. This makes sense as Kate had an early tennis lesson.
It could have been that Kate left first in the mornings to play tennis so she wasn't there when the children ran away.