If my Hickey theory is correct then u will not find one bit of hard evidence that contradicts it.
Not a single witness saw it happen including those inches away from where the muzzle blast would have been.
Is that hard evidence contradicting your theory?
Obviously, I could argue that an invisible unicorn took the head shot and that you can't prove any differently. Is that the level you're working at?
Unless, of course, you have a reasonable [meaning 'credible'] explanation for why nobody heard or saw the shots being taken.
Do you have such an explanation?
Hard evidence is physical evidence.
Witness statements are not hard evidence. Some are more credible than others.
Mortal Error (Donahue & Menninger)($30) & JFK The Smoking Gun (McLaren)($30) have a good analysis of witnesses re Hickey & re the AR15.
One bit of hard contra-evidence can falsify my theory.
A picture, a footage, a dent in the chrome, an exploding head, the smell of gunpowder etc etc --- hard evidence.