These elevations proposed does not make sense to me.
If you look at this frame from TMX you can see Trump and, in the back, you can see James.
This frame is taken at 1.65m above ground. I know this because TMX is using the gap in the fence to film Trump.
Here is the gap on DJstew footage:
The other way around from James footage you can see people walking near the fence at the same line of sight of trump ear elevation. This way its proven that James was not sitting down on the bleachers at time of this footage.
If the bullet came from that line of sight from the wall of building 6 it would pass at the elevation of James footage which is 0.5m above the rail. Keep in mind that yellow line crosses the top of the window. If the shoot was taken from below that line then the fire would pass way above James head.
If the line of fire hit the rail and Trump years the correct elevation is from Crooks position.