Tsubasa: Reservoir Chronicle, in all the years that I've been following it, has always been a little bit of a tangle for me to figure out (for a start, the name- why Reservoir?). The CLAMP multiversing isn't what does it- it's just the fact that things are really messed up in that world.
1. For a start, there's the issue of just who "Syaoran" and "Sakura" really are. I, along with the rest of the CLAMP fandom, was pretty sure they were AU Syaoran Li and Sakura Kinomoto from Cardcaptor Sakura, but Chapters 189 and 191 shot that one to pieces- the child who later gets imprisoned by Fei Wang Reed is actually the son of Syaoran and Sakura, and the princess he meets upon his arrival in Clow Country isn't actually named Sakura, she just says that's her name.
2. Just which dimension did that kid "Syaoran" come from, anyway? Chapter 189 sees him walking into Yuko's shop, having been sent there after his mother had a dream. But 192 shows "Syaoran's" use of some kind of spell involving a square compass like the one Syaoran Li uses in CCS, which makes it seem like he was sent to Yuko's world from another dimension- and that his parents are another AU CCS Syaoran and Sakura. Which makes sense, since Yuko, in Volume 1 or 2 of xxxHolic, says something about wanting to meet 'that cute girl and her boyfriend' who lived in her world, the 'cute girl' being the owner of Sakura's card-sealing wand from CCS- Sakura Kinomoto herself. Also, the reference to a 'boyfriend' would sound out of place for someone who had a seven-year-old child, wouldn't it?
3. The timeline- what the hell happened? I'm sure CLAMP intends us to ask this question, but I really badly want to know- what on earth could have warped the timeline so completely that Fujitaka is "Sakura's" father in the original timeline, but the Clone Syaoran's adoptive father in the altered one (with Clow Reed as the cloned Sakura-hime's father)? What happened to Fujitaka and Nadeshiko in the original timeline- did they die? (they needn't have). And, among other things, who is the person Clow misses, and wants to see? (somewhere in Chapter 130/140-something, when Sakura gets a feather back, she remembers) I'm curious...could it be Yuko?
4. The names. It's funny that both the child who gets sent to Clow Country and the princess he meets there don't give out their true names, even to each other- xxxHolic did once go on about the importance of true names....and now it turns out that not one of the travellers who began the journey, gave out their true names- Fai was Yuii all along, Kurogane Youou, and the Clone Sakura and Clone Syaoran are both clones of people who didn't disclose their true names to each other when they first met. Wonder if not having the 'true' names of their prototypes affects the nature of the Clones...
5. What's happened to Clone Syaoran? He hasn't been heard from since Clone Sakura's soul dissolved into petals (does that mean she's dead, then? But the Clone body she had is still in existence, while the real princess's body disappeared on being cloned, according to Fei Wang Reed. So there's the real princess's soul in that glass tube, a cloned body with Dr Kyle and Fei Wang Reed...looks like at least one couple will not get a happy ending in this manga).
Arrrgh, this is confusing...
5. What's happened to Clone Syaoran? He hasn't been heard from since Clone Sakura's soul dissolved into petals (does that mean she's dead, then? But the Clone body she had is still in existence, while the real princess's body disappeared on being cloned, according to Fei Wang Reed. So there's the real princess's soul in that glass tube, a cloned body with Dr Kyle and Fei Wang Reed...looks like at least one couple will not get a happy ending in this manga).
Arrrgh, this is confusing...