To address the substance of the thread, on the assuption that an abduction occured, we should look at all possibilites of how an abductor might have entered and exited
We do so on the basis of the evidence available :
The patio doors were closed, but unlocked
The shutters and window were wide open, but curtains closed
The front door was closed ( locked ? )
The forensic evidence suggest no-one climbed either in, or out of the open window
So, lets take each possibility in turn:
1) The abductor entered through the open doors, and exited the same way with the child in his arms
2) The abductor entered through the patio doors and exited through the front door with the child in his arms
3) The abductor had a duplicate key and entered through the front door, and left the same way with the child in his arms
4) The abductor had a duplicate key and entered through the front door and exited through the patio doors with the child in his arms
5 ) The abductor entered through the patio doors and passed the child through the window to an accomplice, then exited via the front door empty handed
6 ) The abductor had a duplicate key and entered through the front door, passed the child through the window to an accomplice and exited through the patio doors empty handed
There are no other possibilites
Speaking for myself, I think every one of those possibilites raises questions and doubts