Kakuzu and Hanzō followed Snow Leopard's example, forming the hand signs for Impure World Reincarnation.
They didn't want to die.
No, they were already dead. They just didn't want to return to the Pure Land and sleep again.
What did it mean to be alive?
As long as I can still think, I'm still alive.
I think, therefore I am!
Kakuzu had lived from the Warring States Period until now, but he hadn't lived enough. He hadn't earned enough money, either.
Hanzō was the same. He had died an untimely death, full of regrets.
If they could avoid returning to the Pure Land, they would do everything they could.
No one wanted to be forgotten like the dead.
Especially men like Kakuzu and Hanzō.
But Sasori didn't follow Snow Leopard's lead and form the signs to evade the Pure Land's summons.
Sasori's final death had been more like suicide.
He had seen Chiyo and learned that she had developed Life Reincarnation to revive his parents and save him from hell.
But Sasori had done too much wrong. Turning the Third Kazekage into a Human Puppet and setting off the Third Shinobi World War had put redemption beyond his reach.
Sasori had felt deep guilt toward Chiyo, who had tried so desperately to bring him to his senses. That was why he hadn't dodged her final attack.
The information about Orochimaru he had given her before dying was a sign that his loyalties had changed.
But too proud to admit it, he had called it a reward for Sakura and Chiyo defeating him.
Besides, Sasori could break free of Impure World Reincarnation through sheer will, even if the caster never released the technique.
In the Original Work, Kabuto had reanimated Sasori to fight Kankuro and the others.
Kankuro had brought Sasori