Okay, so you're saying it's a spin-off because you think a major part of the story isn't major? Because nothing else about DDD says it's a spin-off aside from naming convention.
And I question how much you love the series, considering you don't even know how important BBS or DDD are to the plot.
I don't get why you still care dude. You just gotta be right on the internet, huh? I'm not changing my mind, and I love Kingdom Hearts, and you can't take that from me.