We don't see much of his face, only a partial profile. And I agree, the hat probably was meant to obscure his face from the camera's view But in the little that is visible, his nose appears to protrude much moreso than in the mug shot profile(s). Even more than the seemingly different body size, it's the nose that "stuck out" in my mind, (pun intended). So I decided to view the video one more time yesterday, pausing every 2-3 frames. I now see that the shadow from his cap falls right over his nose, making it appear larger.
I've been like you, JO. I presumed it must be him because people who know him and have seen the mugshots and the video say it's him. So I accepted that as fact on an intellectual level, but my eyes didn't believe it. They're a bit more convinced now, not 100% though.