I was reading up on the statements by the tapas waiters and by the first nanny on the scene shortly after 10pm and without doubt Kate was in hysterics screaming like a banshee from the balcony. In those circumstances I fail to understand why the twins weren't roused?
As for your comment Sadie that there is little doubt there was an abduction your judgement is sorely impaired. It could very well be that nobody knows what happened to Maddie. Its not the first time a youngster has fallen down a hole.
Any combination of the numerous pointers outlined by Sadie point to abduction.
If Madeleine left the apartment of her own volition you will have to consider how she could have done so without leaving a trace.
(a) She was not wearing shoes
(b) She had never seen anyone opening the window or the shutter of her room
(c) Her fingerprints were not on the window or on the sill or on the shutter mechanism
(d) Her fingerprints were not on the front door
(e) Her fingerprints were not on the sliding patio door
(f) Her fingerprints were not on the gates
Do we even know if a three year old was capable of opening the doors or the window? If so it is unlikely it could be done without leaving a trace.
An adult intruder on the other hand would take care he/she left no forensic evidence; however since the initial forensics lifted from the scene were useless we will never know if he/she was careful enough.