Well, in both their cases, it can be argued that she's the single greatest constant in their lives. real!Syaoran gave up his life to stay with and try to save her (and you have to wonder if his parents are a part of that) and Cloney had nothing before her. In both cases, she seems to be their only friend, and much of how they see themselves is from her. In Cloney's case, I also think that the petal he grabbed when her soul disappeared was a part of her soul that became his soul. 9I admit, that is my favorite Syaoran/Sakura pairing, but I agree that the CCS versions are more fleshed out. And 11, which creates a huge mental block with me and shipping type things.)