If De Mille directed Duke in 10 films, I bet he would have won more Oscars. De Mille was never cookie cutter which I feel Ford was, and what robbed Duke of many Oscars. IMHO.
I won't take your bet, whose to say? Mr DeMille was more on the "inside" in Hollywood than Ford. But, Duke was way out, politically, in Hollywood, so, I think that would have had more of an effect than the director.
Chester 
Suddenly, as we approach Christmas, Chester's signature smilie makes more sense.
