Question to Grimes and Amaral: If it was a ruse to force the arguidos into making a confession did they miss actual evidence with Eddie absolutely positively marking the top of that sideboard? I wouldn't trust this video as being anything thing but a staged.
0:36 seconds into the video is the first shot of this third person.
2:39 seconds into the video is the 2nd shot of this third person. Is MG the person by the window? So who is producing the silhouette that passes in front of the camera? This person (that passes in front of the camera) becomes MG so the person by the window was not MG. Eddie actually sniffs this person's hand. This third person does not signal the dog and seems a little scared of Eddie as he pulls his hand back when sniffed.
4:59 seconds into the video is the 3rd shot of this third person. His socks are not a white as Martin's. He also seems to have been on the wrong side of the camera if it was meant to be Martin.
Follow the dog as he goes through a short passage and meets up with Martin at the next room but the person seen in the same sequence of film has been left behind, so that proves there was a third person there.