Thanks for the link to the video Brian. Nice work. You say you saw what might be some movement that you describe as a blob. Could you discern where specifically in the window you think you saw this?
I went back and looked at the Holland version again since he said it was the highest resolution to date.
I would not be able to say with certainty I saw a person, that's for sure. I think any motion I was looking at would have been just above where the box edge was sticking up (presumably that was the outer box that was fairly bright), where something looked to be near, or just above the window cross bar, slightly above that brighter box rest. There seemed to be some change in light background intensity around there and I don't know if that was motion or if could be some variation in illumination of stacked boxes in the background that varied with the lighting or "pixel noise" that others have talked about, I don't know, but the blob seemed to be more centered and above the box at the ledge, and not right at either edge of the window. Could having the limo being further around to the left relative to the window case at that time, while turning in the intersection and harder to continuously track at that time cause Oswald to temporarily lean right or move further west behind the rifle rest boxes and position him for better viewing in a standing or crouching position that morphed into a first shot position, I have no idea.
Bottom line is I don't think I can add anything to help you out on this question. Sorry, I wish I could.