That sandwich wrapper would would have to be made of some very shining material IMO Alan, comparing it to his arms in Wiegman, something ultra reflective, I guess I'm still comfortable with the bottle or white china mug argument which he could have put down in the preceeding 20s or so. Also I considered your folded arms scenario even doing what you asked and covering up his "left hand" but I don't see it yet. The stabilized footage has him, for me, moving his arms/hands perhaps unwrapping something but since every part of him is moving due of the quality of what we have avaliable, I'm not very sure about that either.
Unrelated but relative.
Since Brian mentioned it at least three times here and concluded that it was another "death nail" before anyone(me and not everyone) knew what he was referring to I have to say it at least once, especially since his analysis is the one we're all suppposed to rely on. Someone drew a picture of a slim Oswald and placed it over PM, I like it but Brian mistook the drawing for a real image and concluded that PM could not be LHO. That's the strength of his analysis, major errors can enter into his enthusiastic approach at any time.
Now regarding what the author of this drawing wrote, he sees a slim Oswald with a reflection in the glass, making us all see a wider person, well, if you put him in a position so that his reflection is seen in that glass from Darnell's POV then he's on the landing, too short and most probably not LHO. I have no problem with just an oversized shirt, don't see any wide hips, or anyway too big to be LHO or any unaccounted for male of similar size stood with one foot down, or even a shorter one on the landing.
Like Michael said, I too would love it to be him and I wouldn't up and leave the case like someone else suggested he would.