I worked at one of the big 4 accounting firms. If an outsider stepped in to a meeting room not knowing any of the participants they would swear the partners are the most clueless people in the business.
Because they have the confidence to say I don't know, explain that to me again, ok now explain it to me from that angle. Then ask a million more questions, make you go back and research absolutely every minutiae of any issue and then get back to them.
Then they'll start asking more questions.