To settle this nonsense once and for all, I made a small GIF from Wiegman's perspective.
Wiegman sees an opportunity for some dramatic footage and runs to the steps, the camera POV passes over the steps
The camera goes from shaking wildly to being incredibly steady for a few seconds, which means he isn't stumbling, but is resting his elbow on the the top step which is obvious in Steve's Bell still, in Bell's stabilized footage and the height of the camera in Wiegman's footage.

Bell's stabilized footage of Wiegman.

A clear frame of Wiegman on the steps.

JohnM
Excellent work, John, as always!
I think the next step would be to find someone here in the forum who lives in Dallas or very near, to go to Dealey Plaza and take their cell phone, and mimic Dave Wiegman filming from the steps, lying in the same position he is in in the Bell film, and also in the position Royell claims he's in?