This is the same problem faced by every other game line whose publisher has opened up the option of fan publications for sale. Ultimately, it's on the community (which extends far beyond this forum) to discuss whose work is good and whose work is crap, and to make that known through ratings, reviews, and forum threads. Then it's on the referee and the table to decide
what their T2k universe is.
Having seen several vicious urinary Olympiads over the canon status of various fan works, I have little faith that a timeline consensus can or will emerge from any source other than the publisher. And even that will meet harsh criticism, if not outright rejection, from portions of the fan community.
- C.