Its all very well to say that and to put it in a comic, but if it isn't in the game, why should it be considered Canon? Simply because its approved by LAs (or whoever)? I'm sorry, I don't buy it. If they don't put it in the game, an expansion or K3, then really, it should be disregarded. It isn't like an Anime where you have to read the Manga in order to understand the series and need the series to understand the film...
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The only cut content that should be introduced as canon should be that which can fill in some of the plot holes, but that alone. (Droid planet can be left out, but the HK Factory shouldn't)