True.But IMO LE leaves the impression ,that there may be more than 1 participating.If,or it was known to them that it was 1 person,they would have made that clear.as in " The person responsible".IMO
Not really. What police have said is that they cannot say that the voice is connected with the suspect. What that tells me is that the video was taken first, and then for whatever reason (abduction) only audio is available. Police cannot say 100% that the voice is connected with the suspect because they cannot see his lips move when they hear the audio of "down the hill".
That doesn't mean that there are two suspects, or that police are entertaining the possibility of two suspects.