Tornado Ali
You don't understand how the captain bidding system works at Cathay.
All commands are awarded in seniority in HKG. So at the moment guys with a seniority # in the high 900s can hold a pax command. If you are already a pax captain you can bid a pax command vacancy or if you started your command course in HKG you can bid a Pax base vacancy. If you are a freighter captain and you have fulfilled your freighter commitment and you have the seniority to hold a pax command you can bid a pax base vacancy.
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.