: One reason you might also not consider GURPS canon is
: because comparatively few people own GURPS. Since the
: role playing guide isn't exactly history (it's
: original creative content), it seems to me that you
: could argue it isn't canon until Bungie proclaims it
: so (which it has not) or until some certain critical
: mass of Myth GURPS owners exists.
But Bungie HAS called it canon. Well, they didn't use the word "canon", but they were selling it at the Bungie store as "a vital source of Myth information" or some such, which is pretty much the same thing.