To me, it kinda makes sense that Edward would become a valet, gentleman's gentleman, head butler, Hazel, whatever. As Edward Collins, stiff Victorian concerned about family honor and all that jazz, he was obsessed with it to the point of maximum stress. It was a load of responsibility. However, as a sophisticated domestic, he no longer carries that load, and yet remains in an environment to which he is accustomed (refined and all that). He can still be concerned about family well-being, but it doesn't have to consume him, as it's someone else's family, not his. Edward, as a fancy-pants butler, can now have the best of both worlds and none of the malarkey of either.
Gerard