Can Hebi sasuke really defeat kakuzu? I don't see it. This isn't like Kakashi vs Kakuzu where it was 3 hearts plus Kakuzu vs Kakashi. And because this is a vs situation, sasuke isn't gonna just blitz Kakuzu from behind and take down one of his hearts right off the bat like Kaakshi did, while Kakuzu was distracted.
This time he'll have the fourth heart monster, in addition to his own heart. That's 5 hearts. Now hats sasuke vs 4 heart monsters plus Kakuzu all at once. Kakuzu alone is gonna give him trouble, but because of the hears flying and attacking from range, it means he'll constantly be evading and on the back foot. Sauske doesn't use shadow clones, so it's gonna be even tougher.
Honestly don't see how sasuke is winning. He'd have to kill Kakuzu five times before running out of chakra, yeah right. And he can't even focus on Kakuzu properly while defending flying monsters that can shoot high level elemental ninjutsu, and even combine elements like fire and wind which sasuke can't even defend against.