Due a world-wide pilot shortage and underhanded industrial action; supply and demand actually. KA took anyone. Mostly HKA pilots.
If I were a local pilot at KA. And noted the conditions HKA pilots accepted in coming to HKG. I would be jaded as well. They worked for less than local conditions, undercut everyone, slid over to KA and got a pay rise, housing and legacy expatriate conditions. All on the industrial efforts of others.
Good luck to the local guys at KA. But what are they doing?