I couldn't agree with you more ^^ Unfortunately, things are going so crazy in TRC lately that I don't even dare to believe in my own thoughts ^^;;
But as you said, Clamp pretty much spent their whole time, since the very first volumes of both TRC and Holic, throwing hints right and left about the *mysterious* and invisible parents to be CCS|SxS. And for the parents to use the exact same magic, specially the Star Magic in Sakura's case, Syaoran's chinese jiang, the fact they both are from CCS=Holic world, them being related to Clow Reed, even up to their chinese fashion should indeed be definite and absolute proofs of their identities.
That said, Clamp has been using a VERY convenient excuse: that the Logic of the World was overthrown and that everything was a mess, that even the Past and Future were mixed...from that point on, what seems so 'logic' might not be and Clamp might just as well use this *excuse* to make up some crazy out of the world scenario *unfortunately*

Finally, that aside, I really want to know where are Parents|SxS bodies? (we can see that they are somehow transparent in the fight)