Can I put an uninformed (and certainly non-expert) opinion on this post? How about we look at the postulated factors and say that they all, to a greater or lesser degree, contributed towards the crash? Surely we can then say that, with a degree of certainty, various individuals may have been in the position to stop this tragic accident. It seems to me that the incident may have been a classic 'chain of events' that could have been broken: fuel upload, incorrectly configured landing gear, FOD, tailwind on departure, shut down of a serviceable(ish) engine, decision to go for an airfield rather than crash landing, VIP aircraft obstructing the taxyway near the overrun, company pressure to ensure that the Premiere Service is provided on-time on-spec etc etc........
My other point is that we should not seek to muddy the waters. Many of you will be aware of the RAF Chinook crash on the Mull of Kintyre. Although the issue has not yet been put to bed, it has not been helped by idle speculation and "experts" going-off at a tangent.
Off my soapbox and abuse me if necessary. Please just remeber this is a forum for opinion.