Jack the Ripper - The Case Reopened

First they decide Martha Taborn is the the first victim, I agree. So we can be pretty sure her killer was a soldier so why when the discuss the killers identity, do they totaly ignore this?? Another more plausible documentary questions one of the so called witnesses who was found with the body of one of the victims, who then claimed to have jyst found her, said he'd go get police but didn't, and gave false name and address, however this person wasn't a soldier either as far as i know, But If we believe Martha is first victim, we should believe killer is a soldier. This needs examining more.....