I don't think the theory that Madeleine was taken from the apartment by a stranger is plausible ... not in the circumstances described by the McCanns
That open for instance
No-one climbed in or out of it ... yet it was open
None of the 'explanations' given for it are 'plausible'
... Well, except for the one that says the window/shutters were opened ( but never used for exit/entry ) because it was a staged break-in ... that, at least, is a logical explanation
Here we go again. You have seen this dozens of times Icabod. Why do you keep saying the same things, over and over?
If two people were involved in the lifting and carrying, then the lifter is likely to be a woman known to Madeleine. Someone she has confidence in.
Entry is made by the obvious way in, the front door. A door that is deeply recessed and in almost complete darkness. Also a spot that no-one passes and behind a fairly high wall.
Entry was made to two apartments in the block via the front door in the weeks before Madeleine was taken.
Reasons for the window to be open:
- As an escape route in emergency
- To give moral support to the woman inside - and instructions
- To pass things through from man outside to woman inside (maybe chloroform pad?) and receive back
- to give the false impression that maddeleine climbed out of the window and wanderd off.
- To give a little natural added light to the room
- Maybe to illuminate the room with a torch from outside. The lifter would have both hands full.
- To warn if anyone came via the front, or if alone to see if anyone was coming.
- Heriberto has a theory involving only one man who lifted Madeleine through the window
There are other reasons, but it is late and I am tired. Plenty of reasons for the window to be open.
Even if only one person was involved 5 of those reasons stand.
BUT NO reasons if you are determined that The Mccanns Dunit

and refuse to consider what SY believe ... that Madelleine WAS ABDUCTED.
All the above imo, of course.