Forensic audio expert says there had to have been a second RFK shooter

A Forsenic audio expert analyzed the one existing audio tape of the RFK shooting and found that there were sounds of at least 10 shots being fired (possibly 13), within those shot sounds there were two instances of double shots (two shots so close together that they couldn't have come from a single gun), and that the security guard who RFK Jr alleges was the real shooter was holding a gun with similar rifling characteristics to the audio in the tape.