I'd be shocked if Jack didn't make the cut, but Xin's not on the show anymore. According to the official website ( http://long.btv.com.cn/long/index.htm ) he actually didn't make the final 16.
Anyway, I'd usually check the website myself, but it hasn't been updated in weeks. It's in Chinese, and although I can't read that, I usually either copy and paste the text onto a translator (I use: http://www.omniglot.com/links/translation.htm ), or copy and paste the characters: “龙的传人” into the search engine at: http://www.openv.tv/ when the that's not working. All the videos are in Chinese as well, but it's easy enough to see what's going on.
I haven't a clue as to why either of the websites have yet to post anything about the "top 5" yet. But hopefully this will be fixed soon. Even so, I have a strong feeling that Jack and Jerry did in fact make the cut, and wish good luck to them on whatever goals they have yet to accomplish.