So if all the US based Canadian captain spots become available you would need presently an approx. seniority # between 970 and 1020 or below, plus US citizenship or the right to live and work in the US. If nobody wants the US slots or there is no US citizens in the above seniority # range these positions either stay vacant and flights will be crewed with HKG crew or CX will close these vacancies and flights also will be crewed by HKG captains.
That's how the new system works.
No, that is not how it works. How it works is CX agrees to the above with the AOA, then ignores said deal by sending freighter flying CN and FO jobs to AHK. In an ironic twist, we are the ones training our own replacements!