I think I've got to agree with Emiko about Sakura. Sure she is being terribly unjust to Syaoran, but it's understandable why (you can't really expect someone who has just gone through a trauma to act rational and nice, can you?), and it makes her a more human, interesting character.
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Am I the only one not irked by all the hand kissing? Come on, people, we may not know for sure which Syaoran Sakura is going to end up with or if Fai and Kurogane love each other or their respective girl at home, but one thing we do know beyond all reasonable doubt is that FaiSakura is not happening. In other words, we can safely accept Fai's actions as pure platonic expressions of motherly love, and treasure these moments as the sweet, adorable scenes they are.
As for Sakura's wish... I'm thinking it probably somehow involves self-sacrifice or putting herself in danger - I think that's what would upset the other three the most. Maybe she wants to wait for the clone to come to deliver the feathers he has gathered, and then hopes to follow him back to FWR to fight, bargain with him or offer herself in exchange for Syaoran.