I did say that at the end of KH2, he would eventually go back with Sora.Doesn't sound like a lot of room for argument. He'd have to go back sooner or later.Diz said:He holds half of Sora's power within him. In the end, he'll have to give it back
But look at Roxas before he even know about Sora. He seems to be wielding the keyblade well and fighting them off just fine.
Same with Sora at CoM~ he was owning them left and right and even held his ground against Marluxia.