1. You mean Chinese national women's team? If so, most of them are using hurricane orange sponge, but Liushiwen, Zhuyulin and Wangmanyue are using blue sponge I guess. It depends on your style and what blade they uses.
2. Yes, Liujikang is using this rubber, he is sponsored by them
3. Skyline series is designed for penhold players before, for example, Malin used skyline 2 and Wanghao used skyline 3, Xuxin used skyline 2 before, I think he switched to hurricane 3 now. It is more and more difficult for pen hold player against shake hand player these days since ITTF made the ball even bigger to size 40+, more and more pen hold players play like shake hand player. Also with the technique developing, in some ways, which makes the games much simpler than before. Skiline is always not popular compare to hurricane.
Hope this helps. Cheers.