Ryan Stoughton said:Wow, that's... hard-core. I think that might take it further than would be useful to a GM. Certainly it would make the Great Hundred go over length.
There's a design issue you have to keep in mind. You should probably present the material without a statement of canonicity, but still somewhere in the back of your process, have what you want to be canon decided. Then it's just a process of presenting different viewpoints that explains how something works or came to pass.
I quoted an example from the old World of Darkness material earlier because it's truly superlative to D&D in this regard. Unlike, say, the Manual of the Planes or Fiendish Codex I, their product lines rarely presented anything as absolute, solid cosmic truth that the players had access to. Vampires drank blood and came out at night and had supernatural powers- everything beyond this was conjecture and hearsay, often colored by generations of mythological comparisons, religious/political ideology, and good old-fashioned ignorance and bigotry. The very lack of canonicity could be said to be at the core of Mage: the Ascension, where magi fought one another because they couldn't even agree with each other on the nature of reality and other abstract concepts.
This is the basic approach that I take to my own homebrew. Knowledge (history) checks rarely give you one straight answer, for example, because different historians gave differing accounts on events that they might have even witnessed personally.