I don't think I have ever seen anyone anywhere, certainly not on this forum, claim an abductor climbed through Madeleine's bedroom window while carrying her.
The preferred options appear to be the front door ... or passing her through the window to an accomplice.
I believe the Rebelo investigation checked it out by sending a man through carrying a burden.
Preferred options by whom> oh in the 'abduction' story to make it fit? ahh nice move.
The whole idea derived from the McCanns saying that a child was abducted and this is known because the mother, just happened, to notice a door ajar at a different angle her husband left it on his last visit,. the window was open and curtains were blowing and whooshing sounds were made to emphasis this.
So, at that point there was no mention of open doors - front or back, ( why didn't this door slam shut when the 'abductor' carried Maddie through the flat)? I find the whole thing too absurd to give it credence anyway.