Surely the real point is whether further public money and time should be consumed on BOIs of incidents long ago. BoIs were conducted and reviewed in good faith. Where blame was determined, it was effectively a matter of opinion, albeit based on evidence available - unless a court martial made a guilty finding based on evidence placed before the court. Clearly where those who would have been at risk of a CM were deceased, no court martial occurred. Under the presumption of innocence we have in UK law, it follows that those deceased were innocent. I really can see no benefit in going over old ground.
Surely, the MOD is stretched enough as it is trying to run our Forces without adding a string of old BOIs to re-investigate.