R. Star wrote:
Canon is just another word for opinion.
No, it has nothing to do with opinion. The biggest mistake people make in their interpretation of the word is thinking that it has anything to do with opinion or authority or rightness or realness. It just means the original, core body of work as distinct from derivative works by outside creators. It's not supposed to be a value judgment or a dictatorial command. It's not supposed to mean absolute consistency or inviolate truth, because any long-running canon contradicts itself plenty.
The canon is just the main, ongoing story
being told by the original creators or their direct inheritors -- a story that, like any work of fiction, is subject to error or intentional revisionism as it continues to be told. Sure, other stories by other creators won't necessarily be acknowledged by that core story, and might not be consistent with it in every respect, but so what? They're all just stories made up for our entertainment. And we can enjoy them as stories and be interested in the ideas they contain.