I think the video speaks for itself... and quite well, i.m.o.
Let's call it what it is, a piece of propaganda by people with a predetermined conclusion, attempting to sway other peoples opinions with lies.
You seem to be suggesting that it was discovered the kitchen window could be fully secured (as discovered by police on the morning of the incident) from the outside?
It was discovered that the window could be secured from the outside. Experiments were conducted.
The attempt to concoct a different picture by talking about window catch positions etc, is simply subterfuge. Particularly when the window itself hasn't actually been pin pointed as the route of exit.
Isn't it also documented that the window was opened at some stage whilst the police were in the house (flies/smell or something). Was this before or after the PC Bird commenced taking photographs at about 10am?
The master bedroom window is another possibility, there may well be others that JB knew but hasn't shared.
The ability to have exited the house, allows JB to be a suspect, other evidence shows that he is guilty (as tested in court and at two appeals and by the CCRC's independent reviews). The evidence showing his guilt also supports the fact that he could exit the house.