Full intel?
Against Muu, Kisame makes a small lake via Bakusui Shōha and set's up several Water Clones as he himself hides below the surface. If Muu appears in an attempt to Jinton Kisame, a Daikodan can be prepared to counter act the technique. If he splits and tries to take the clones by surprise, the original can use their suiton chakra or the lakes to trap the Mu's in a suiton prison. If Mu goes into the water, well, Kisame would tell by the distortions made by his body, or via shark's electromagnetic sensing/smell.
Oonoki's a much harder opponent, as his large scale doton will effectively nullify many of Kisame's mid level suiton. Though, as long as Kisame can either out produce him in chakra or tear his jutsu apart with a mix of brute strength and subterranian travel, I don't see it being a lasting problem. Jinton's a bigger danger, it'll probably come down to Samehada/Kisame's fusion vs. Jinton. Depends which ya' think acts first. I'll favor Kisame, just due to the vast quantities of chakra Samehada absorbs in moments.