Yea we all know about the kahki pant guy. The witnesses described others. At the end of the day you are right, the surveillance videos sure know the whos whats and wheres
Videos can be lost, edited, or simply not released. People will have differing stories. Wonder if there are any independent video or did police seize all or like in another shooting ask everyone to delete their video. I always wonder in situations like this if they might be trying to hide people, maybe rogue undercover or people they turn to get information from?