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Just to reiterate something mentioned but (at least from my knowledge) never recorded on serendip.

In principle professionals should be able to comfortably alternate between professional concepts and lay/comfortable terms that is accessible to the maximum amount of people. But in practice that is not true, one reason being because they are working with other professionals having all of the jargon be common language, allowing the esoteric behavior to speed up communication.

One way to distinguish between being skilled and being talented in that skill would be in the persons ability to put their information in laymen terms. If you can do that successfully then, I feel, that shows a sign of mastery and in that sense all teachers should be masters.