I disagree with the X on this first image in terms of points of origins of shooters. The crossing point in the upper right bleachers (right side of Trump) does not correspond to where the man in the white shirt was standing, which was the side bleacher on Trump's left, behind Trump when Trump was shot.
Solid orange lines from the tree line (where SS seemed to be looking from the roof) explain how the hydraulic line was hit as a bullet missed Trump and hit the hydraulic line on the small crane. That orange line passes thru the upper right corner of the bleachers, but that spot is not behind Trump - Trump was pointing and looking at that jumbotron.
The man in the white shirt was hit on the first or second shot. The solid green line, crosses center stage with the orange line, approximately where Trump was standing, and points to the upper roof on the opposite corner (the left) which is where people were looking and pointing at the man belly crawling on the roof.
The jumbotron that Trump was looking at when shots rang out, may have obscured the view of SS on the ground of the tree area, possibly preventing them from seeing muzzle flash (if any).
The patsy on the roof then visible to SS on the roof, deflection away from someone presumed in the trees, or water tower (out in the open doesn't make sense). Hidden in trees makes more sense.
JMHO