Quick initial analysis:
Some sources claim there was a second shooter on the water tower. However, looking at the attached video and comparing it with photos from Google Street View, it would appear, that, yes, there is a walkway up there on the water tower, so in theory someone could have accessed it. But on closer inspection, there is no line of sight to the speaker podium from most of that walkway up there, because of trees in between the tower and the podium.
This is evidenced by Google Maps an the attached video.
While the video is blurry, a person is not discernible on the water tower on the video, nor does there seem to be any movement up there during the shooting and after the shooting.
Some sources claim there was a second shooter on the water tower. However, looking at the attached video and comparing it with photos from Google Street View, it would appear, that, yes, there is a walkway up there on the water tower, so in theory someone could have accessed it. But on closer inspection, there is no line of sight to the speaker podium from most of that walkway up there, because of trees in between the tower and the podium.
This is evidenced by Google Maps an the attached video.
While the video is blurry, a person is not discernible on the water tower on the video, nor does there seem to be any movement up there during the shooting and after the shooting.