Captain is the 'Senior Manager' on board there are, of course, other managers.
In BA the CSD is a manager and the Pursers are 'cabin managers'.
It is normal in BA for the Captain/ FO to make the first announcement and then others follow.
I'm not sure the majority of SLF really give a monkies what names are used if the service is good and all goes well.
When it turns to **** thats when it counts!