I hate to repeat myself again, but you're wrong about it being "more official" than most EU novels.
I'd suggest you check out the official forums and check the books and comic section. There's a link to a site that has, what most insiders regard, as the most ACCURATE explanation of the different levels of "canon", and where each book, game, comic, short story, movie, cartoon, etc. fits in terms of which "out ranks" which. You'll find that what you're saying is absolutely false.
I'll grant you that, yes, TotJ "trumps" KOTOR in terms of which is more "canon" (unless Lucas himself says that the KOTOR events trump TotJ), but TotJ is not any more canon than ANY of the EU novels.