Am I right in assuming that at prosecution they said he used that window to get in and out or are they saying it could have been.? T
It was the downstairs toilet window to enter and the kitchen window to leave. Its already been established there is no proof that he entered via the toilet window. So in my opinion showing there is no proof he left via kitchen window will not achieve much.
Since all the windows and doors were locked from the inside, the Kitchen window is the only way Jeremy could have left the building. I don't think its possible to prove its impossible for Jeremy to have left via that window.

Nevertheless if you look at the photo you can see the sink and window area is very tidy. This means that Jeremy after he got outside must have been standing outside leaning through the window neatly putting everything back in place
