Well then, how come CCS!Sakura, being the most powerful magician in her world, haven't come chasing after FWR for kidnapping her boyfriend yet, then?
Seriously, I still find it far-fetched. To me, it's seems to be a lot of wistful thinking involved in the thought that R!Syaoran could be the one from CCS (that is, that he has a soulmate waiting for him somewhere so that he won't be alone if TRC!Sakura choses the clone) - up until now, no characters from older CLAMP works have appeared in their original settings, so why would Syaoran? No, I think it's best to accept TRC for what it is; an alternate universe story that is quite complicated as it is without messing with already finished mangas' storyline.
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I think the most authentic spelling of the twin's name would be 'Yuui'. That's how it's spelt in katakana in the chapter. Gosh, I still can't think of Fai as having that name. Fai is Fai (Yuui is a much prettier name, but that's beside the point). =(