This is why I asked for a Full Photo in order to provide context to the Head/Individual. Based on the YouTube presentations that LeRoy Blevins Sr did regarding shots being fired from the Pergola, I think that head/figure is supposed to be positioned/standing in the Opening to the Pergola Shelter that is behind Zapruder & Sitzman.
Yes, taking a look at the Moorman photograph and overlaying the first image provided in the OP this work has been done on an area to the left of Zapruder & Sitzman and just to the right of the left hand wall of the pergola opening. I have seen attempts to show a figure in the opening one from the top hence my question about the gunman's height. Looking at that area I only see blobs which you could interpret as a person but not quite the image provided in the OP. The issue of trying to enhance or use filters on fairly indistinct patterns of blobs is I'm afraid a common one. I would be happy to take a look at a higher res image if one is provided but looking at the highest I could find I'm not convinced it is anything more than a random pattern of blobs, but still waiting to be walked though it by Israul.
