The really fair way to do things is to apply a consistent, objective standard. That's where the original idea of letting the makers/owners statements decide for us came from. They're the ultimate third-party for these purposes.
That's the problem: they AREN'T third parties anymore. Nowadays, many statements are made by underlings, who may do this with look at the debate (while top people restrain from giving direct answers to hold the fans).
Look at Saxton who is:
1) A vs.debater.
2) Author of a book that tips the balance greatly
3)And a worker at SW house so he can declare his own book canon and overriding novels.
While here the clash is obvious, who can guarantee other canon statements weren't masde with vs debate in mind?
And books? Wasn't the one who declared "Mosaic" canon (20000 degs vaping temp) the one who wrote it? And , vs debate aside, wouldn't people just push for their books being canon, so future stories are based on them and everybody who reads those, has to buy this book as well?