Thus they would be idiots not to make a big show of this being an impartial and transparent investigation. It carries a small risk of evidence leading in an unexpected direction, but less risk (given appearances so far) than if they seem to be hiding something. That could kill the whole project.
Definately. It is much more in the commercial interest of the project in the bigger picture, to investigate openly, identify a shortcoming in procedure or pilot decision making (if that is what it was -I have no knowledge), and then make a corrective action plan for that. The alternative being the whole aircraft has a dark cloud over it, which is perhaps undeserved.
There are a number of historical incidents of demo flights gone wrong, and it's appaerently just been easier to blame the pilot (particularly when he cannot defend himself). The demo flight is a less than ideal situation for safety. Operations outside the "normal" procedures of commercial transportation, and making the most of the plane's performance to impress people - a challenging combination....