I'm glad I'm not the only one who actually paid attention to the opening lol. Of course Kairi is introduced as a candidate but that doesnt mean she will be. Plus, with that one cutscene with roxas telling sora that "I thought it would be okay being you" (implying he isn't happy now..), and that "it has to be you" (the one that saves him and everyone else) it really does seem he is going to be saved and fight in the end. Sora also said he deserves to be his own person. (Evidence, not proof.) But Kairi is a princess of heart, they have to protect her...it just doesn't seem like she will ultimately be in the final battle. Its Kingdom Hearts, you never know what can happen