I haven't read the latest chapters at all... actually I am still at volume 12... I'm only buying and reading the Del Rey translations and not even daring myself reading anywhere else... because I would find that useless buying it if I read on ahead (even people says to but them to support them...XD). I haven't gotten volume 13 yet though. =D However my twin has read up to the latest chapter and she says it is getting really really good! So I am really anxious.
to answer your question, I think CLAMP made the first 13 volumes so that it would actually lead to the "good part" that you're talking about. Just like Bleach. =D They didn't get to the really good part and the main story until like the 21st volume.
And the thing about Syaoran that you mentioned... you got me curious!
I can't wait to find out. ^^