What then constitutes the "complete truth"?
Does it have more to do with how thorough an author's examination of a topic is, or how balanced?
For example, would you regard as more true: a complete examination of just one side of a case, or a balanced yet less in-depth discussion of both sides?
I would say complete truth is the verfied facts to the best of your ability, not slanting them or using misleading phrasing to change the meaning of what a real source said, just so you can use it as a source in your footnotes. For example, in the AA wikipedia article, one of the contributors claimed that facial examinations on a 1994 BBC TV special proved 'with certainty' that AA was AN. Actually, the program was NOVA, and while the ear examinations did show a good match, no one said it made her AN. Also, the facial examinations, by Geoffrey Oxlee, concluded that AA and FS were one in the same. The writer used Kurth's "Tsar" book discussing the show as a source, and for awhile it stood, until another poster and I proved that the information was not only misleading but completely false.
I do not believe everything must be balanced on both sides. I believe you can choose only one side, as long as you don't change things around to suit your cause if the view presented is not what was actually stated in the original source. I also believe speculation and offering up possible scenarios are fine- lawyers do this in court all the time- BUT they need to be presented in a way that allows the reader to know that this is what it is and not confuse it with a source it didn't really come from.