You can say whatever you please. It's a sleuthing community which encourages opinions
My comment said I suspect he may be a police informant. That's my 'suspicion' of the moment amongst many others
It cannot be denied that he remained at liberty for a week with a child's body not far above his head as he slept, ate, etc. Police have admitted they did not handle the investigation well at all and have admitted to basic errors of judgement and procedure - all of which have been loudly criticised by ex senior Scotland Yard officers publicly, as you may be aware
It would be naive in the extreme to suggest that *IF* someone was known to be a valued informant, they would not be handled more 'gently' we might say, than someone who was not a police informant. And it does appear that police, deliberately or otherwise, have not been as aggressive in their handling of this case as we might have expected