but with a 30,000 hour mustering veteran at the controls, something catastrophic certainly appears to have happened.
Whilst it may well have been a mechanical failure causing the crash, it also may not have been. Just because someone has 10 full logbooks doesn't automatically mean that a cause of the crash was mechanical failure (think ABC AS355 crash at Lake Eyre). Could've been anything from mechanical failure, medical problems, CFIT etc
Rossy was a great guy, but speculation is best left until after the investigation (if there is even one given it was experimental). Condolences to friends and family.