I'm not surprised at all that Duke displayed his knowledge and integrity when asked about open baffle dipole subs. He's displayed to me the exact same vast knowledge of in-room bass sound wave behavior and the explanations of why/how 4-sub distributed bass arrays are such an effective solution with the exact same integrity.
As far as my understanding of psychoacoustical bass principles and DBAs are concerned, I think of Duke as Mr. Miogi and he's showing me how to wax his car.
Tim