Well, for political reasons Sui/Han need to have as much international exposure as possible. They are student of Bo Luan, former pairs partner of Bin Yao, who's in charge of not only the Pairs national team, but also the entire figure skating national program. Sui/Han are not on the national team, and Yao has not spoken particularly highly of them in the press, saying that they are still too young to know whether they will really end up doing something great, despite winning everything on the international junior level last year, thus far exceeding the results of all of Yao's young teams (Z/W, D/W), and also S/Z, P/T, Z/Z in their junior days. Notice S/H weren't invited to Shen/Zhao's big show in Beijing on the occasion of their wedding, while Z/W and D/W were. They also don't get Chinese federation funding for getting nice costumes or hiring non-Chinese choreographers. Their coach is obviously very good among Chinese pairs coaches, but I think they should really spend some time with someone like David Wilson or Lori Nichol to work on their lines, posture, edges, expression, etc. Improving those things and therefore their PCS is absolutely crucial for their progress.
Yao & Luan are obviously not on good terms (they should really work together, given the dearth of good coaches in China), I don't know exactly why but I heard that back when they were together, Yao felt Luan's lack of technical skills (in particular solo jumps) was what kept them down, and has remarked to the press on various occasions that the woman's technical skills make or break a team.
Right now, S/H are finding success on the international scene *despite* Yao and the federation's lack of support. Yao is telling the media that junior success doesn't necessarily translate to senior success (in reference to S/H), so S/H really have a lot to prove in their GP assignments. They have to get as much positive exposure as possible, so that perhaps they can get more financial and political support within the federation despite not being coached by Yao.
Results speak more loudly than anything else. The other Chinese junior team that just won JGP Czech and qualified to the JGPF is also coached by Luan Bo, as is another young team that just won a Chinese domestic championship at the senior level (and beaten out Yao's more experienced teams). They are the other two most promising young pairs teams in China right now, but unfortunately both are too young for GP's. Otherwise, D/W already have two GP's. Z/W had two, but because they messed up on their paperwork for Skate Canada somehow, they couldn't skate there as assigned -- but anyway apparently Z has a foot injury and may not be able to skate at all.
What other Chinese pair do you have in mind that you'd like to see given a chance at CoC?
It's always good to have more than one coach within a federation, no matter how good they are. Different coaches have different styles and see different things, and may be able to work better with different skaters, or give different things to the same skaters.
So while it's a lot of pressure/stress on Sui/Han, their GP success would lift not only their own fortunes, but also those of their coach, and those of their training mates, as well as possibly their ice rink (for future generations of skaters), which is a provincial training center, outside of Beijing.