When I was reading the previous thread last night, I believe a few people posted pictures at night looking into the lit house by media on Fox Digital: There was one picture that caught my attention and made me think exactly what you stated— The picture was of the lighted kitchen and the focus was the counter and kitchen sink area with bowls and dishes… What I also saw in the picture, was potting soil on the counter next to a small upright houseplant beneath the window, left of the sink.
I don’t know if that’s the same widow that has the hand print on it (let us hope that it’s his and he was careless enough to push up on a window to open it with his bare hands — because now that I think about it: it may have been difficult to get traction or a grip to push up the window from the outside with a glove on), but even though the kitchen area was in disarray, the dark black (which would mean the soil wasn’t there long enough to dry out and may have happened when he came in) soil was markedly noticeable next to the plant in front of the kitchen window.
I don’t know why an intruder of this nature would upright a plant that he possibly knocked over (maybe force of habit to clean as a reflex?) while crawling through a window to commit murder, but I think it’s a viable theory of entry, nonetheless.