I'm going to hold out on answering myself because I's like to hear other members views.
Coincidences.
How likely is it that the lack of rigidity in Sheila Caffell's body, suggesting a later time of death than the other victims, does
not place in her in the frame as prime suspect, given that her mind was known to be subject to periodic bouts of tormented delusions, such as the incident described by Farhad Emani?
How likely is it that supporting evidence had to be cobbled together using corruptive police practices, in order to frame a person who was in fact guilty?
How likely is it that evidence needed to be withheld, for example bloodied palm / handwritten note / bible / scene and event logs as per build up & entry by TFG, in order to convict a guilty person?
Imagine the odds on that? That police and prosecution witnesses would have to go to such extraordinary lengths, altering, adding to and ommitting from statements, in order to achieve a conviction of somebody who was
already culpable and guilty in real terms?
How likely is it that the second head of the investigation, would upon retirement be tasked with overseeing security at OCS, yet have played no part in complying with and fulfilling the demands of a man who concocted the wetsuit theory and who arguably misled the jury as to his own indirect gains stemming from the conviction of a nephew he despised?
How likely is it that police would mistake a grey haired male for a dark haired model, when describing the same body as a suicide?
What chance a murderer would cunningly foil all kinds of police at the scene ranging from SOCO's to senior detectives, to the extent that a distinguished officer - the lead detective would refuse to even consider prosecuting him, yet the very same murderer has supposedly confessed the crimes to his own girlfriend, who he cant even be bothered to maintain as a serious long term partner post murders?
There are many more aspects which could be described in similar fashion.
For example: How likely is it that SOCO and senior detectives at the scene would stubbornly write-off a two gunshot victim as suicide, as if to rap up the incident and move on?
And here's a classic: How likely is it that the 'junior' detective supposedly responsible for achieving the right conviction by way of his dogged determination, just happened to be one of the most corrupt police officers ever to operate in Essex?