why I think that Kakuzu can beat Jiraiya:
Kakuzu can counter J-man's katon with:
his one katon for a stalemate.
his katon + futon combination.
his doton to change the landscape to block the attack.
or his doton domu armor.
Kakuzu can counter J-man's katon + oil attack with:
his katon + futon combination.
or his doton to change the landscape to block the attack.
(and if we take the Anime in to account to see can use suiton or suiton + futon aswell)
J-mans hair attack: (lion something?)
should be able to be countered by kakuzu's threads.
Kakuzu's katon
kakuzu's futon (blowing him or them/it away)
the katon/futon combo annialates it.
and the doton domu can tank it.
J-man's Rasengan: (first of all it have to hit him, and unless it hits a heart or a mask, it's a waste of chakra)
lets just start with the obvious, donton domu can tank it.
and kakuzu can shot/push a huge amount threads out of the area that is about to be hit while he runs/jumps in the other direction, and no im not saying that the threads can tank the rasengan im just saying it can slow it down if enough are sacrificed to prevent a hit.
also, if J-man trys to take him down with a rasengan what prevents Kakuzu from catching him mid attack and stop his momentum and strangle/penetrade him with his threads?
and J-mans Taijitsu aint really a factor here, if Kakuzu can out perform Kakashi, he can outperform J-man aswell.
J-mans frog song genjutsu:
having 2 hearts in him at all times should disrupt it instantly right? (aint that how genjitzu work?)
and how can J-man even pull the from song off when he is being bombarded with an elemental barrage?
the only way I see J-man having a chance in this fight is if he gets in to sage mode, and even if he managed that (somehing I highly doub he will be able to do) then he still can't penetrade kakuzu's doton domu, and kakuzu still have 5 lives J-man needs to take down in the time the SM last, so it's a matter of kakuzu outliving, well what? 3 minutes? while he can bombard J-man with his elements, or go in to long range mode and simply fly away/keep his distance for the remianing time.