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Two points HB. Firstly the way a Crime Scene is interpreted is critical. In an incident such as WHF where all the occupants were killed, the positioning of items used helps to working out what 'MAY' have happened. Primarily this is done by examining the placing of bullets and more importantly their casings.
It is possible by such positioning to manipulate the story to be told. Given the manipulation of and the withholding of documentation in this case I do not trust the findings in relation to bullets and casings. You yourself point out that SC was on top of a casing!!!?? This being the case all scenarios are to be approached with caution. Even the police cannot say with any degree of certainty what actually happened at what time and where. Only the victims knew.
Secondly you are being hard on Taff. He left the scene with the SIO, Harris to go to a meeting with the GPO. He was under orders. There were other detectives around and about and they had all been briefed. They would have been contactable by radio if required.
I thought it wouldn't be long before you popped up with a conspiracy theory.
The casings are a reliable source of untapped data as most were photographed in-situ on the day of the murders and certainly before close of play on 9th when the soc was released back to JB.
There's no evidence the police or judiciary were trained in soc reconstruction at the time. Hence when Lawson asked Fletcher at trial if anyone was shot outside the bedroom upstairs he replied no. Today would be very different. It would all be mapped out in 3d computer graphics. But much of the data has been preserved so the CCRC could order the opening up of WHF to take room measurements.
For SoC:
Blood stains on flooring - available/images
Location of casings - available/images
Distance of shots - available from pm/forensic data
Trajectories - available from pm data
Wound tracks - available from pm data
Victims dimensions - available from pm data
Layout and size of rooms - available from soc images and WHF