Sunfish,
You seem to miss the point. To say that CASA should never have to shut any operator down is just stupid.
Even Brian admits the stick is there and will need to be used occasionally:
If subsequent audit found no action made in addressing problems raised, that's time the big stick comes out.
They are the regulator, not the Ministry of Cuddles.
That said, from my own conversations with the pilots, there does seem to be little substance to CASA's action in the Barrier case