Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

First, it isn't a hand rail, Backes. It is a hand grasp. Quit pissing on the English language. Now, let's compare:

If that is the shirt cuff on the right to which the arrow points, why don't we see it extend downward? If the jacket sleeve is pulled back enough to expose the shirt cuff above why not going down? It seems to be doing it on the left.

 Here's another view from Altgens. If that's his exposed shirt cuff, why doesn't it continue down to the bottom?

Shouldn't the exposed cuff continue being visible down into the wedge? How could it not?

Remember that it's been proven beyond all doubt that that guy in back wasn't Hickey:

Two different hairlines means two different men. So, knowing that, and knowing his proximity to Hill, it leaves the authenticity of his hand in doubt.