Honestly, I would've never known all this stuff about how the Axel / Saix pair probably got its start from someone with the novels. The only novel I own is the one for 3D... Maybe I'll check out the CoM and KH2 ones then going by comments above.
It does feel at times like Nomura is the one spurring on the shipping of SoRiku, Axel/Saix, and even Eraqus/Xehanort now (although I'm not as attached to that one as the former two). I'm not sure if that's because he's actually interested in those relationships while knowing that companies like Disney and SE wouldn't allow it to become canon in any scenario, or if he's cynically smart enough to know that queerbaiting often causes fandoms of anime to grow or become super-charged thanks to shipping. Both are possible, I suppose. Either way, the content is nice regardless; I didn't really ship Saix / Axel until after BbS and especially Days--but I didn't see the additional KH2FM scenes until it was released stateside in the 2.5 ReMIX years later--so the writer probably has more responsibility than anyone else in making it. And, on another note, I'm glad Saix in particular is latched onto a popular character like Axel in that way (if they're doing it purposefully) since it probably means the character'll stick around in the spotlight for longer, too.