Sorry, I just don't understand your comment.
Sorry to butt in-the possible response to alerts such as TCAS was one objection to the two person rule at our outfit..i.e. the issue of what will a "monitoring" cabin crew member do if they hear a voice from the ceiling, see you disconnect the autopilot and start climbing or descending without warning them/telling them what you about to do and why.......
(Edit to add:I know the standard response is the CC are only there to open the door but sadly there's always been an issue with unofficial "mission creep", certainly at some airlines.)