I don't understand why the window catch issue is being seen as of so much interest. If the window with the "6 o'clock" handle (which I was unaware of until recently) could open sufficiently for a person to get through it, that means that they could easily leave via it after opening the top window as well, reach into the kitchen via the main window to replace any disturbed items, and then set the window's locking bar to fall when the window was shut and banged. Finally, they could reach through the top window to move the handle of the other window to the 6 o'clock position and also set the top window's locking bar to fall when that window was banged shut. In that way, they could leave quite quickly, leaving both windows fully secured, with no signs that they were secured from the outside. I doubt that anyone ever did this, but it's certainly a possibility if the main window could open far enough for a person to step through it.