Dimensions of window aperture?
Height of lower edge of window above FFL?.
"Dimensions" of abductor and child?
Mass of child?.
Obstructions to aperture?
Is it a one man or mulitiple men job?
Get yerself a good text book on ergonomics.
Read mark inwardly digest.
Plot it all out and form your own opinion.
Without knowing the window dimensions or how many people were involved you will be guessing [or p*****g in the wind as we say].
I'll return in 20 pages to check progress 
Prejudice doesn't solve crimes ... in fact in conjunction with incompetence it is probably a real barrier to achieving anything positive at all.
Only an idiot would assume that an intruder would exit premises when there are two perfectly good doors to walk through ... three if you count the doors from the bedroom to the patio.
If the embarrassment ... and he surely must be ... that is "expert" Moita Flores is an example of what was investigating Madeleine McCann's disappearance ... it is little wonder such a botched job was made of it.
In my day I could have been through the aperture that Rebelo is studying without touching it. Madeleine could have been passed through it without touching it.
There is not a burglar in business either back in 2007 or today who would view an aperture that size as any impediment should he or she wish to pass through it. The guy who entered Mrs Fenn's apartment had no bother exiting via a window despite Mrs Fenn attacking his leg.
I don't know what is going on with people like Moita Flores making idiotic statements and demonstrating their ignorance among other things, on television.
Somebody surely has rattled their cage by granting Scotland Yard enough money to continue investigating what actually happened to Madeleine.
I've not read through the forum as yet ... has anyone turned up any information on the burglar Anjos claimed was carrying out a robbery at noon on the day of Madeleine's disappearance?