Kakuzu and Hidan.
Hidan is skilled with his scythe, while he won't be killing Kimmimaro, he can stall him long enough for Kakzuzu to kill Sasuke (and I, honestly, don't see that taking very long at all). Once that is done, it'll just be Kimmimaro. He'll be tough because of his Kekkei Genkai, but with Hidan being a very frontal (and annoying) distraction, Kakuzu can take his time and analyze him for weaknesses (I didn't see him do anything that might suggest he has any real chakra control and Kakuzu would probably pick up on that; I mean, the man has 70+ years of shinobi experience under his belt. I'm sure there is little he hasn't seen or heard off, Kimmimaro's Kekkei Genkai included.). Ultimately, I think Kimmimaro will lose via drowning (if he gets knocked off the bridge and is assaulted in the water by Kakuzu's water heart) or a mass elemental assault. Hidan MIGHT get lucky and cut him, but I doubt that. Either that, or they simply trap him and let him suffocate to death.