Of course, this is the main issue for many,including the police. Inconsistent times etc.
This blows well out of the water that the parents were vigilant and adhering to a timed schedule for checking the children as they implied at the beginning.
We have read many little instances about this being 'acceptable' as it is done in many ,many resorts. The baby listening thing- they were mimicking (?) Turns out they were NOT mimicking the professional service as they are timed and scheduled. Other wise how would anyone know if the children were being checked.
This is the biggest stumbling block in my opinion. They didn't check as often as they claimed and that is why they can't recall,who,when,where,how long for!
There are no independent witnesses who can time frame any of them from 5pm that day, until Maddie was announced as being abducted.
Now, just in case we need to be reminded, the parents didn't physically check the children whilst in the apartment, they 'listened' and the reason they gave was THEY DIDN'T WANT TO WAKE THE CHILDREN. hmm Light sleepers they were known to be. This was the one night they all slept through,well... screaming shouting, shutters banging ,wind bellowing, curtains flapping, being lifted and moved to another apartment.