Kingdom Hearts II Question/Theories

So ever since I started playing KH2 and I saw that Roxas and Sora fight cutscene I always wondered. Why does Roxas only use the Oathkeeper and the Oblivion, I can't think of any theories on why and its starting to really bug me. Anyone have any theories on why?

 

Why not?
Maybe he just likes them:p or perhaps he doesn't have any other (cept for the opening when he's using Kingdom Key)
Riku and Mickey never change their keyblades either..

 

Here's my theory: Since Sora and Kairi are the only good guys with nobodies, Roxas, who is Sora's nobody, has the keyblades that represent them. The Oathkeeper represents Kairi and the Oblivion represents Sora. But that's just a theory.

 

I was thinking the same thing, and to add another dumb follow up question... WHY is it that Roxas/Sora in his Forms can have TWO keyblades? how is that possible if he was only given one? And, too, though this is really just something I want to dispute about, I wonder why they are all seperate keyblades, but not instead the same keyblade that is transformed by different chains, as that would make more sense; Sora would then only be able to choose different froms of a single keyblade, of which he only has one. [I would surmise.]

Hmmm.

~A.