It's a good leader. The crash could have been caused by human error or technical malfunction of a kind which didn't leave a physical trace or wasn't properly investigated (the AAIB investigated only what it was asked to investigate) or a combination of the two. For the finding against the pilots to be sustained certainty is needed.
And the one thing that characterizes the investigations after the crash is uncertainty.
The MoD denies there are uncertainties: it points to what it calls "hard evidence". This is evidence from the manufacturers whom we trust for such basic information as the waypoint change.
Since when would you trust a manufacturer's evidence - on its own and without independent verification - after a major fatal crash?