Fearless implies that the coroner has already decided that there maybe a need to be aggressive or confrontational with the sources or evidence or those involved in the incident. I see no evidence so far to suggest the coroner will not get full co-operation to get to the bottom of this incident.
"Fearless" may not apply to the coroner's first two responsibilities. It may apply only to the third, which is to "
assist in the prevention of other deaths where possible." If that means banning flight displays, making such a ruling in the face of opposition that would almost certainly be loud and powerful would seem to require more than a little fearlessness. And if given the chance, I would join an anti-ban chorus.