What did the motor appear to be doing, from these exalted, omniscient insights?
It might have been anywhere between flat out to idle to being in the process of fully sh1tting itself...BUT....isn't there a part of the display flying process that checks ones planned v actual height before pulling through the apex of a vertical figure?
If the previously mentioned AAIB's view that :-
""appeared to be responding to the pilot's control inputs" one assumes a view taken from the view recorded on the Go-Pro's rolling wings level could have been one option?
Quite how or why aftermarket camera footage is being treated in the same way as FDR information from a legal perspective is interesting because its fitment (the aftermarket video camera) has less to do with flight safety and more to do with capturing the event for other purposes, mainly I'd argue entertainment.
If we allow reasonable arguments about process to be turned into kicking a can down the road, it leads to a loss of credibility and is damaging in the long term.
Lets not forget that the display season ticks closer and with no published or accepted conclusion to the accident clearly the better management of any specific risk associated with the accident is impossible.