
Originally Posted by
abrojtm
Well firstly, Marluxia isn't the leader of the Organization. He's like number eight or something. He was put in charge of Castle Oblivion while the leader was gone. Next, Namine is changing/hiding Sora's memories mainly because she is lonely, she has been held in Castle Oblivion for a very long time.
DiZ is mainly just a man of mystery. He mainly just tells Riku to choose between Light and Dark the whole Reverse Rebirth. King Mickey doesn't know him, but when he meets DiZ, he says that DiZ is very familiar to him.
The reason people think this is because as Sora you fight Riku four times. You later find out that that Riku is just a model of the real Riku.
Yesh...
Edit: Beast's Castle is in KH2.