Sounds plausible. Sounds logical (to me at any rate, though I don't exclude other points of entry/exit at a later time in the evening prior to 10pm). I expect Billy to try and tell you why it is not. I wouldn't expect any other sceptic or serious researcher to have a go at explaining why they think your theory is illogicial and implausible though.
We don't know when and we don't know through which door or window the intruder entered or through which door or window the intruder exited.
We don't know why the window was opened but we do know that Rebelo ran a reconstruction which included passing a large bundle through the window. Suggesting he was checking the feasibility of Madeleine being passed out that way.
For years sceptics ruled that raising the shutter from outside could not be done. That is a proven lie. It has been proven that it is possible and I think everyone posting here knows that for a fact because they have watched demonstrations of it being done..
I think the arguments about entry and exit points is a distraction and deflection from the main point that Madeleine McCann vanished from her bed and a stranger with an horrific profile is presently investigators prime suspect.