In Tsubasa, Race isn't the same, as Hideki is japanese in Chobits, he may, or may not be Japanese in Celes, and I do not think Hideki would be out of place in Celes, because in Chobits he was a farmer, and I can see him as a farmer in Celes as well.
What I think is when Ashura-ou wakes up to find Fai, he will hurt Chi in the process of getting out of the spell. Chi will lose her memory, as in Chobits, and find the one just for her in a boy, Hideki, who finds her, and what happens after that is just in the fans minds.