hey this is fun, it's like watching two people trying to waltz on a highwire
i think a hypothetical film is documentary if it's mainly factual and doesn't try to appeal to emotions rather than rationality... if it's got lots of cuts from subject A to subject B that are designed to make you happy/unhappy/pissed off/whatever then it's starting to wander away from the whole documentary area
having said that, it's all subjective