When I see the video enhanced (thanks Red Beard), I swear it looks like the guy is wearing a Groucho Marx gimmick glasses/nose/mustache. While I doubt that, I would bet he is in disguise. The hair is just ridiculous and must be a wig. That would explain why the new sketch does not match BG's real hair that a witness saw later. The puffy top half of his body does not match his lower body and he is obviously wearing too-large pants - his legs look quite skinny. Could this be a schoolmate who wore a disguise and followed them?