Because people always make the mistake that S-E games are always made by the same team. There's quite a couple of separated teams (FFXII - Ivalice Alliance team; Nomura's Team; Kitase's Team; Yuji Horii's Team and so on). 

Level 5 is the co-developer for DQIX, but Yuji Horii is the mastermind behind DQ and he's the prime developer and director, in conjunction with Akira Toriyama. Always was and always will. 

As for Crisis Core copying KH? Are you for real? >_>

Well, 3rd Birthday will have a lot of tie ins and explanations about prior history, but I think it won't be enough. Parasite Eve and Parasite Eve 2 had a ton of history, and they're going to utilize PE2's history a lot. 

I hope that S-E and Sony get their act together and release PE and PE2 on PSN before the launch of 3rd Birthday.

sorry I never played crisis core but from what I seen back then the combat looked like KH but I might be wrong cuz I never played it.  

It just plays on the basics as any action JRPG game does (just like KH too, KH wasn't the first to utilize that system), but other than that, it infuses the menu systems of traditional FFs in real time, and uses the DMW which adds a whole new layer of strategy to the game. In that aspect, especially on the optional missions, CC reaches a level of difficulty and strategy that no KH game has reached.

I just checked some video in youtube, forget it the combat is a little inspired by KH maybe but far from been like it. It looks like a mix of KH and kh:CoM but too bad cuz I think kh got one of best combat system ( I know its real time so thats why )

Im sure I got confused bcuz of the FF combat game that Im sure the combat looks like kingdom hearts.

I dont know if u ever tried to beat sephiroth in KH2 but that was hard and KH maybe easy bcuz you really got control of you characters which I like. I dont like when a game get to play more than I do. ( im talkin about games like ff13 and ff12)

Actually Dissidia is far from being KH like. If anything, it would be heavily inspired by the Dragon Ball Z Budokai Tenkaichi games. Even Z-Axis movement in Dissidia is pretty similar to them

they should make an eihander remake =D

Now you just try to contradict me cuz from what I seen combat (moves) are really inspired by KH.

Im sure if KH wouldnt have existed, either this game wouldnt or the combat wouldnt look the same at all. Even the game engine looks like KH, so stop tryin act like KH hasnt been influent.

and one more think, I dont what you got againts KH but I think even square would agree with me that crisis core and dissidia have been inspired alot by KH

Dude, trust me, I've played more Dissidia than you can possibly imagine (300 hours and still counting, I even created the official Dissidia thread here in VGC) and it's far more equal to Dragon Ball Z Budokai Tenkaichi than Kingdom Hearts.

Kingdom Hearts was a button mash fest, while Dissidia is far from it. In fact, if you button mash in Dissidia you will lose so damn fast you'll be left wondering what the hell happened. 

Dissidia has Z-Axis movement and lock-on and fast zoom equal to Dragon Ball Z BT, the BRV and HP attacks movements are input in the same fashion as Dragon Ball Z BT. Only similarities between KH and Dissidia that I could find was the R1 block. 

Plus, you're trying to imply that KH even invented the mechanics that it implements. That's far from the truth. Heck, KH borrows almost all of it's elements from pretty much every other Hack and Slash that exists. Might as well say that KH is similar to Devil May Cry, God of War, Ninja Gaiden and so on.

And you're implying that if KH didn't exist, Dissidia wouldn't have been made. Dude, what the hell has Dissidia got to do with KH? Do you know there already was a fighting game done by Square in the past? Ergheiz rings a bell? 

KH and KH2 are amazing games, two of my favourites for the PS2, but stop trying to imply that other action-rpg done by S-E are KH copycats.

Edit - And if you want to drag this discussion further, send me a PM. Either you're here to discuss 3rd birthday, or not.