squawk6969,
Exactly. Talk of who was responsible for writing an ICAO rule is just a frivoulous red herring meal.
The status at the moment is:
- Let's say the mathematicians have got it right, and Class E link airspace (at Broome) is "safe enough"
- That then triggers the next level of enquiry... "can a higher level of risk mitigation be provided .. at the same cost?"
- Most pundits ( including the quoted airspace reviews) say yes, C ( or D) could be provided at a similar cost.
That really only leaves one credible option ...