Queen The problem with Hutchinson is two fold. Firstly, Abberline went on record to say he believed Hutchinson to be truthful. Secondly, serial killers only stop due to one of three things - physical incapability, incarceration or death. While we don't know a lot about Hutchinson, we know he lived on into the 20th century, well after any possible similar killings had ceased (serial killers almost never change their modus operandi), and would therefore had stopped killing for something other than the three accepted norms.
Fairies What Trevor Marriott wanted released (he's an ex policeman with his own theories which most Ripperologists have declared to be rubbish) were not Ripper-specific files but ledgers detailing many other crimes dating into the 20th century. So, if the police do want to hide something, it may well have something totally disconnected to the Ripper. The argument proposed by the police in the court case - which was backed by the judges - were that the ledgers name police informants up until 1912 and while they are all dead, and probably their families, they are concerned about the message it sends out to current informants and future informants (ie, police say they can keep names confidential but in 20 years along comes the next Trevor Marriott wanting to solve something else, court says OK then, and an informants name comes out and they and their families are put in danger). That's what the argued anyway.
Amazing how many former policemen say "ah, we know who did it, the secret is in the museum". You really telling me that not one of them in all these years wouldn't reveal all? You realise how much money they could make by doing so? There is everything to gain by revealing the truth, if it exists, financially.
Almost ALL theories can be debunked. The Duke of Clarence one for instance. Proved AT THE TIME he couldn't have committed some of the murders because he was in Scotland in front of dozens and dozens of witnesses.
Can anyone come up with one sensible reason why, after 130 years, the truth that - if it was true - one of the killers was a nobleman would cause any problems for anyone in 2018 and would still require covering up? I've yet to read one.