Unless you or whoever told you this was present when it happened, there is no substance to what you say. When Kenneally wrote his report Bamber hadn't even been arrested and wasn't considered a suspect (officially) so he had nothing to compare Sheila as a suspect with. And why would TAFF Jones take part in the interrogation of Bamber if he KNEW Sheila was the killer? Someone like Simpson, doesn't get to be such a high ranking office by giving into a silly old man and a couple of farmers. The press were already scathing of the police, switching to Jeremy made it even worse, not better.
I'm not aware of the exact dynamics involved at the time, regarding Boutflour / Simpson - Ainsley / Kenneally and Mugford / Jones. Several things are supposed to have happened on the same day - and I suspect the scheming behind the scenes had already began in earnest.
DCI Jones dealt with Jeremy Bamber professionally. If he 'interrogated' him or interviewed him - it blows out of the water any claims he was blind to Jeremy's alleged murderous scheming.
Not one poster on here has yet explained
why the deputy head of CID would want (or allow himself to be involved in) a mass murderer going free?
At which point did the press become scathing of police?