1- if wonderwise was an espade i think he would be number 8. the reason he defeated ukitake was bcause he came from behind while ukitake was shocked. so grimmjaw would pwn wonderwise
2- the reason why he was battling yammamoto like that was because he was specially designed to extinguish yammamoto's flames emmited from his zanpackto(ryujin jakka) thus his release estinguar
3- kensei did not sustain any injuries from the battle he should be okay and is probaly withe visard.