Yes. They are all servants in the Phantomhive manor.

[His expression doesn't change much at this question; in fact, he looks a bit bored, and shifts his weight from foot to foot before responding.]

Of course he's been dedicated; what sort of butler would he be otherwise? As he says himself, "he is a butler to the core." If he seems extraordinary, that's only because he is. He's expected to be, since he is a servant under my employment.