Among the best on TV. And for those who don't get it, Penn Jillette is a great orator, and Teller never speaks. But Penn is also 6'6 and 300 pounds while Teller is about 5'2, 120.
I think the analogy was the talkative Scott vs. the quieter Harris (I know you got it, just clarifying for others).
He just stays silent as part of the act. We saw their Vegas show and he talks normally when greeting fans after the show