I've been through this a thousand times. SY have investigated this sighting. You don't carry a 4 year old in that way. Crecheman was carrying a younger lighter child in that way. Smithman had a different carrying style for an older child. Simples! The window was closed when he was seen. So who opened the window Sadie?
Madfeleine was a light child. Not very tall for a three, yes almost four year old, and pretty fine boned.
It is my opinion that she was handed over to Tannerman by the lifter in that lying position. The position she was lying in. in / on the bed. She was drugged and scooped up, then passed to Tannerman. Only my opinion.
He was only intending to walk as far as the "drive in" area of block 5 car park ... and then be picked up, so he never shifted her position in his arms. The pick up failed to arrive.
You bet he shifted her position later tho as she got heavy in that position. OMO again
The window was probably opened by the lifter, but could have been opened from outside <<< more difficult, but possible as Heriberto Janosch shows in his video.
All theory, both yours and mine, but I think mine fits better and I cant see any flaws in it. Can you ?