You seriously need to get over your Sony fixation.
Then, again, you don't know what's important.
You misunderstood CoM then, as he definitely was in the Dark Realm for a period of time.
No, you're focusing on the wrong things. You don't focus simply on the end of a book, or the end of a movie when assessing the story, do you? You focus on it as a whole. It's the same with these games. You're only looking at the end, the "reveals", you're not even considering what they actually -mean- for the story.
Why should it matter if "most people" call it KH0? It's not titled "KH0" it's titled "BBS". Even if it is -like- a main game, that doesn't mean I have to consider it one. Though, to me, the title of main game and side-story are rather irrelevant.