No idea, but it really sucks. Birth by Sleep is epic, and you really have to play it! Dream Drop Distance is also really great! So I recommend playing KH2 and then do those. The two games for the DS are just fillers, but still a great time
FFX is my favorite final fantasy! TP ranks among my top favorite games as well, I can never get enough of that one. I've been meaning to catch up on KH games for the longest time, but I've only played up to KH2. I feel like I would be so confused if I started another game, I don't even know where to begin.
You don't have to play KH358/2 days it's just the story of Sora's nobody (But I loved playing it, and it has a sad ending )
chain of memories have a lot of the organizationXIII members dying, and it leads into KH2 so if you were wondering what happened to most of the O13 members.
Birth by Sleep is basically the first KH game (timeline) it explains more deeply why sora ended up with the key blade, and why does Roxas look like ventus. If you're planning on continuing with the KH story. I suggest you play:
KH Birth By Sleep KH dream drop distance
So you get what's going on by the time KH3 is out
or you can just read the story of the games you haven't played
I don't have a 3DS so I have not played ream drop distance. And I plan on getting the vita (since FFX will be on it)
Now I knew that FFX was getting a remaster for the PS3, but I didn't know that it would also be on the Vita. Interesting. I'll definitely give Birth By Sleep a go then. I played Chain of Memories, so I got the gist of Organization 13, but after KH2 all of the prequels and sequels and whatnot started coming out, and I just got confused.