Awesome match up
Killer Bee is really pulling the weight of the Team but honestly even though Kakuzu is one of my favourites, his team mate Hidan pulls him down
Killer Bee's team wins
Kakuzu + Hidan would struggle enough with Killer Bee, however there is one possible way they can win and believe it or not its through Hidan and his death possession blood
Utakata if i remember right could make explosive bubbles all around the immortal Duo, Hidan could take the pain and Kakuzu can harden his skin
Utakata wouldn't actually be useful unless he turns into a Tailed Beast, honestly Hidan could solo him as one hit from Hidan (which is inevitable) and then he's down. Kakuzu can hold his ground against Killer Bee until Hidan finishes up. Then Hidan sneaks up on Killer Bee and tries to land a hit while Kakuzu bombards them with 4 of the 5 Elements (excluding water).
Kakuzu's Earth Grudge Fear could rival Killer Bee's Tailed Beast mode for a while
Yeah im gonna go with the Immortal Duo
Good playout here I like it. Only thing you missed is that Ukataka DOES in fact have more to offer than just his explosive bubble techniques (which I might add, offer flight/defense as well as offense) I know not many people look in to Ukataka as a mainly filler character but I've taken a sudden interest as you can probably tell so here ya go
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These are both listed on the wiki as (Manga only) techs. used by both Saiken and Ukataka. I'd be intersted to see how Kakuzu's doton skin holds up against something like corrosive gas as opposed to just trying to SMASH through it, yknow?
Also, If you are willing to look at Ukataka's techs from his anime episode, a few interesting/useful ones potentially for this matchup:
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Haha well anyway look at them If you feel like this is just a random interest of mine, I wish the other Jinchuriki had done more
EDIT: +rep for explaination