When the BG sketch was discussed in earlier times, some mentioned seeing earbuds in his ears, some, that he was self-dialoguing, some wondered if there was something sticking out of his mouth. (It is all seen on the video, not on the photo, very vaguely, and the validity of any observation about the video is questionable).
However: one wonders if there indeed were two participants in the murders, with different roles, one being somewhat of a scout, maybe, and if they were in communication. This could explain two BG, looking different, and seen at different times by different people. Strange story.