There is no evidence that JB exited through the kitchen window.
Even if it was possible to exit and secure the window when outside it is only proof that he MAY have exited that way.
It proves he or someone else had the ability to enter and exit the farmhouse via that window or by some other means such as the upstairs window.
However all the court required was proof the house could have been entered, secured and exited somehow.
The fact the finger was pointed at JB was due to the phone call from Nevill which made it clear either JB or Sheila or both were responsible for the killings.
All the evidence points to Bamber climbing out of the kitchen window -
He said he knew how to enter/exit the kitchen window - Witness testimony.
The housekeeper said crime scene photos showed fixed items around the kitchen window had been moved - Evidence.
One of the kitchen window locks could be banged shut from outside - Evidence.
The horizontal lock could not be banged onto it's pegs from outside. This lock was found off it's pegs which would not be the case if June/Neville had shut this window - Evidence.
Julie testified that Bamber had told her he had found a way out of WHF and secure the same window from outside - Witness testimony.
I appreciate you and Harters want things such as CCTV, a witness or a photo/video of a crime being committed. Which Harters describes as 'Direct Evidence'. If not available, then it is optimistically claimed there is 'no evidence'.
It is 100% correct that Bamber exited WHF through a window. The only published evidence, testimony and prosecution stance is that Bamber exited out of the kitchen window.
Agree there is no 'Direct Evidence' as this term has been described in this thread. And there never will be.