I suspect it's making use of the 'trusted personal advisor' connotations, similar to the metaphor of having a co-pilot if you will - https://en.wikipedia.org/wi

I suspect it's making use of the 'trusted personal advisor' connotations, similar to the metaphor of having a co-pilot if you will - https://en.wikipedia.org/wiki/Privy_council https://en.wikipedia.org/wiki/Privy_council