Depending on how things go I'm fine with a relationship with either Bao Qian of Xuan Shi, but I just had a thought about a potential Xuan marriage that I wanted to share.
Given the clarification about Xuan Wu territoriality, let alone the fact that Zhengui probably wouldn't enjoy living in that environment anyway, us marrying into the Xuan is probably impossible.
However, Xuan Shi marrying into our clan is still perfectly possible even if he is an important rising star in their clan. While the Cai are probably the best rulers the Emerald Seas have had, they're a young clan and on the time scale an ancient clan like the Xuan plans on, their lumber supplies getting interrupted by the province having less steady leadership centuries or millennia in the future is a very real concern. Having essentially a distant branch clan over there willing to help keep supply lines open in such circumstances could be very valuable to them.
It's a gamble, we might not stand the test of time, but it's a gamble they'd probably be willing to go for if Xuan Shi wants it enough.