So, just to let everyone see what I found. This is the enhancement which really is making me lean towards this being a real shadow figure image.
If you notice that all the other areas of the photograph brighten up nicely. But the dark area where the shadow figure was, is actively blocking the light from behind it. No mere shadow would do that, it would darken the area evenly. But to block the light from coming through from a obviously brighter area takes something of substantial substance.
Thanks for sharing this image.