A "canon" is an agreed-upon set of truths. It can either be:ABED wrote:Forgive me if I'm wrong, but as I recall, canon refers to what happens in the story as opposed to things like fanfiction. In that case, Toriyama's story is canon. What would it mean to say there's no canon?
- mandated by some higher authority (such as the Catholic Church for the Bible, or Disney for Star Wars), and/or
- agreed upon by groups and individuals that did not actually create it (for example, literary scholars on the tales of Sherlock Holmes)
With Dragon Ball, no higher authority has ever laid out exactly what is considered canonical. There are half-statements made by certain people (Toriyama's "side-story" GT statement, Toriyama's "dimension" movie statement, and the Battle of Gods press release referring to it as part of the "official history")... but that's it. No outline. No clear declarations. Nothing.
So then it's left up to fans, who generally don't understand the concepts of a canon the first place, and then also generally don't actually understand the production behind all the various works they're trying to define or exclude from canonicity.
These days, we're basically left with "maybe we can agree that the original manga as written by Akira Toriyama in the pages of Weekly Shonen Jump between 1984-1995 could possibly be considered this base level of canonicity"...
.............. and then beyond that, it's a fustercluck.