Exonerated
There was no doubt in the mind's of anyone who knew Martin that the ONLY reason he put the plane down where he did was that there was NO other option left open to him. He had been left with an unflyable aircraft and very little time or height in which to do anything about it.
So its all kind of academic whether the powers that be in Botswana want to release the report or not - the information is out that the engine manufacturers have concluded the engine failure was due to major blade failure.
Its not going to bring Martin or his passengers back, and it'll probably be lost in the mists of time, but the next question is "Why did the engine fail"? How many times had that engine been over-temped, over-torqued by pilots who didn't declare it. Did it have ADAS or manual trend monitoring. Was there a trend that was ignored? What did the last blade inspection reveal - when a blade is removed, cut and inspected? Any FOD that wasn't declared/ignored??
Its a kind of sobering thought that as a pilot - just because you were tired/stressed that day, that the airstrip was shorter, pax were heavier, take-off was worse than expected, you weren't paying attention to the gauges - BUT it was okay, I got away with it, no-one need know, no-one will know, nothing bad happened - that we may have signed the death warrant on some poor innocent sod in the future.
What about trusting the people we work with - the 'stud' pilots who also fly the same aircraft but are so busy building hours to move to the big jets, who don't really care about the engines out in front of them because hey, they're not going to be around flying small plane for very long anyway, and fresh out of flight school they're invincible anyway. Or the old boy who is beginning to 'lose it' but won't admit that he's slow on power control, who's getting tired but isn't going to be told anything by these kids with so few hours.
Everyone of us who flies has a responsibility to those come after us. Look after the engine in the way that you want everyone else to, make sure that you haven't done something stupid/wrong that is going to cost someone's life in the future. We're human, not gods - so own up when something happens. And trust that the people you work with will do the same. If you're not sure about that - remember Martin, and move on before IT happens to you.