I would urge you to read the views of Keith's brother, Alan Bennett, on what he thought of the 'credible' information given to the police by the author, amateur sleuth and conman Russell Edwards.
Why did the GMP accept his evidence - on what basis did they believe he was providing them with reliable information?
Just a couple of days into the GMP's dig for Keith's remains, Alan had already called Edwards' bluff. The GMP did not say anything until Friday, when they admitted nothing had been found.
Alan Bennett was way ahead of them.