Can't say I agree with some of the interpretation. Pronoun stuff aside, the ending clearly points to Kairi being the one that's most important to Sora. When Sora is in the pod, he's trying to recall his friends. First it's the FF characters, both the ones on the island and the TT gang. He can't fully 🙈remember them. Then it cuts to Riku and then Kairi. He remember🌠s Kairi and the rest he remembers. Kairi is the light he needed to remember so he could remember everyone else.