You made a very good point about Junior's father passing on his name--it's apparently historically taboo in China to name someone after someone else. Granted, it's also historically taboo to marry your cousin in China, and CLAMP didn't pay much regard to that, but...

Considering that the clones will be keeping their memories, the idea that they could reincarnate into Li Xiaolang and Sakura Kinomoto seems right out, as well.