There are two points which I haven't been able to confirm which you are stating as facts, One is that the McCann's patio was bathed in light. I have seen photos where it was light and others where it was dark.
The other point [which I have raised with you before without response] is the trees and bushes being cut back. Again, I can find nothing to support that statement.
I think you be missing a couple of points.
Overnight at the OC there was a single receptionist, therefore considering any form of receptionist checking on children does not apply to the OC. Ad the OC did not have bus loads of people turning up overnight, but who cares.
The back garden issue. At the moment, I happen to have a driveway where the furthest point is at least 50m from the house. But our alfresco dining capabilities are simply not that far away. When we move to Portelas, the garden is a lot longer than 50m. But the alfresco dining capabilities will be around 10m from the rear of the house. And should we choose to eat alfresco while the littlies sleep (one aged 6 and one aged one) there will be a baby monitor relaying their ever move to us.
Perhaps someone with the links can remind us which way the McCanns were facing? To monitor rear access you need to point that way.