I like Fnatic's odds against KOO. Huni's shown he knows how to handle Fiora in lane, at the very least on Riven, and presumably he also knows the match-up on Darius at a minimum. There's no practical way to ban out both, especially red side. I also feel like Fnatic's more likely to pick Kench than ban him, which will probably scare KOO off the Ashe pick entirely in one or more games.
Fnatic's default compositions work fairly well into KOO's, and there just aren't enough non-generic bans available in this meta for them to pick their way out of that problem if Fnatic's smart about it, especially when Fnatic has blue side. I don't really feel like Kuro has any significant edge over Febiven, either.