I wonder why Yukikaze still not have a kai ni..... It is because she got nothing special apart from being the longest surviving ship from WWII until scrapped on 1970's? Or just because "The devs said so"?
Yukikaze can have Kai Ni as Tanyang but i pretty sure it will not gonna happen (yet). She will have crappy torpedo stat as a trade for extremely high FP as the Republic of China Navy (aka Taiwan Navy not China Navy, ffs read wikipedia properly guys) don't use her original torpedo and throw all of them away so her high luck will be useless anyway (unless devs decided to screw history). I think this is the only reason she will not have kai ni anytime soon.