We also could state the above in another way:
If we assume that the FIRST shot that hit Trumps ear ALSO hit either the railing (and/or the Telehandler) or Dutch, or Copenhaver, the location of the shooter who shot that bullet should have been relatively close to the respective lines (green, yellow or red) +- slight deviations in either direction to account for errors/uncertainties. The green line above is the most probable, followed by yellow and then red.
And if we go with that assumption, it seems like we have only a very limited number of areas where a second shooter could have been in the first place. For example, if we just go with the green line as the possible location of a second shooter, it looks like this (represented by the more or less rectangle shapes in green, yellow, orange and red):
View attachment 99882
The green rectangle on the left is inside Crooks building. All other more or less rectangle shapes/areas are located on the roofs. The more or less rectangle shapes are roughly colored in terms of likelihood: Green: most likely. Yellow: less likely than green. Orange: Less likely than yellow. Red: least likely of all locations.