It's not about argument. Just mutual learning.
Funny enough, when that "statistician" (I think he's more known as a great mathematician) first came up with some very genuine estimation technique, the other engineers were very skeptical since they didn't know what he's doing. But the stuff worked. (He mentioned it on a TV documentary. Didn't say what actually that technique was.)
As your sig says "Examine what is said, not who speaks." I don't put faith in someone just because he has a PhD. In the business world, many PhDs gave dreadful advices. (A consultant (PhD, who could give you a four-hour lecture on anything) advised a web development house that they should lay off most of their programmers and sales reps partly because many of them "not working hard enough." The firm eventually failed not because people not working hard enough but partly because the business model (the consultant partly responsible for) wasn't working.)