Were you in the cockpit too?
A perfectly plausible scenario. One thing that you don't mention which I am afraid is perhaps relevant, the bit that everyone has missed, are the human factors involved - although strangely the clues are in Vince's postings and in his initial media comment.
He was on his way to visit his daughter after a family bereavement. His mother in law and his duaghters maternal grandmother (I presume) had died only a few days prior to the accident. Perhaps the rush north was to provide comfort to a potentially distressed relative and this may have coloured the pilots judgement on the day - gethereitis, again.
Whatever the level of Pilot X's ability and competency, any stress caused by death of a close family member( I think these were VH's own words) may be an underlying factor which influenced the outcome of the flight. Financial worries, marital strife and the recent loss of a close family member are all listed as reasons to reconsider flying under the I'M SAFE , before going flying, checklist.
Where stress in a contributory factor the PIC is , sadly, often the last the recognise this, indeed, it is difficult to attribute the cause of any such accident to any single human factor.
In flying, you are more likley to be pecked to death by ducks than be eaten by a crocodile! Catastrophic single failures are thankfully a thing of the past (mainly) but a string of small errors can easily bulid up with fatal consequences. I belive there were a string of events driven by perhaps by(unexpectedly?) deteriorating weather, unfamiliar territory ( FLs), and a need to press on with the flight plan ( rather than stopping and replanning).
I do wonder if we have a classic human factors case rather than an incompetent pilot?
Incidentally, I dug out the AAIB report on the flexwing accident at Glas Maol. No evidence of anything other than a perfectly competet pilot ( aged 56) simply not acting within sensible parameters. Stunting around hill tops is not a pastime to be recommended. I have often encountered rotor off the tops of hills - even in benign conditions and once or twice in PA28/C177 have had to apply almost full power to achieve anything other than a slow descent. The report is only two pages long, and didn't seem to involve anything other than the pilots very honest account of his misadventure.