Easy.
1. Moss – 2nd 4 times in a row (and once because of a misread pitboard during the ’58 season, which cost him the much needed point for fastest lap)
2. Von Trips – because of his fatal accident in the final Grand Prix on his way to become World Champion
3. Villeneuve – Should have become champion in ’79 and ’82 because he was the fastest of the Ferrari drivers in a season that Ferrari had the best car.