Firewall
I suspect you have not been in and around HK for a long time.
CX and KA have for the bulk of the life of KA been sister companies. Anyone who is against the KA seniority system being melded with the CX seniority system on a date of joining is straight out of Oliver Twist.
It is time for everyone to focus on the the things that unite us rather than the things that differentiate us.
Life is too short to do otherwise.