We must have very different definitions of dry humor if those three are your examples.

Steven Wright is dry, at least his powdered water joke is.

If we are talking individual jokes sure. He is the closest of the three and keeps the dead face unlike Nick Offerman who’s brow is integral to the comedy.

However he regularly expresses emotions through gestures and subtle body language, so yes it’s close but not there over a full routine.

Now this was a good chuckle