Of course, Ruto won't spend so much there; Kuria and Gusii definitely, but definitely for Luo Nyanza, it gets party agents to avoid Raila stuffing ballots or gather evidence. In meantime I think Ruto should concentrate on Migori - Obado and waKuria combination - can sneak in some susprises.
Luo Nyanza has a candidate who understands what it needs and is not a battle ground. Moreover Nyanza is growing economically right now at unprecedented rate since handshake. There is a strong perception that like Moi, Ruto will marginalize Nyanza and he cannot overcome that perception when RAO is also running. He needs to spend his valuable time elsewhere. I hope RAO would not spend too much time campaigning in Kaleland either. They should stick to the battle grounds.