Please could we have some Cites as I am at a loss to understand what you are talking of.
I don't really want to retype the book but I have raised a few on FB.
Chapter 1 " First Report" page 3: Danny Collins discusses the likelihood of the front door being used as an exit, he doesn't discount it but then always favours the back door for no particular reason. Quote: "Thus back to a front door exit .... but the method of entry was still in doubt." That is typical of the difficult to understand dialogue in the book, who was exiting the front door? Who was entering the apartment? Madeleine was inside so she only had to go out so there was no need to consider how she got in.
Also: On the same page he says "the metal shutters .... of 5A were impossible to lever up wards more than 1 or 2 centimetres" Now that could upset my theory for how do the burglars open the window if they can't lift the shutters? But it has been demonstrated by Heriberto Janosch that the shutters can be lifted manually.
https://youtu.be/fzpniKAWvUI so I think Danny is wrong.