So that was it.
Hiruzen Sarutobi and Shimura Danzō understood now. They knew where Tsunade and Orochimaru's research stood, and what worried them.
They could use this technique on enemies without restraint, but when it came to their own people, they still had to exercise caution.
Although the experimental data suggested that everyday life would not consume much of the soul, provided the subject avoided injuries and heavy chakra use, if they truly cared about someone, how could they bear to watch him endure such suffering while forcing a smile in the living world?
Even bringing back the dead would, at most, let them help in an emergency, then spend some tender moments with those they cared about and say a proper goodbye. In the end, they would still have to... be separated by life and death.
Seen that way, the resurrection offered by Impure World Reincarnation was not much of a solution at all. It merely postponed death.
Besides, the technique had a major drawback. If the deceased learned its hand seals, he could reverse the process, break his Summoning Contract with the summoner, and escape their control.
Even if they used an enemy's reincarnated body, they would constantly have to worry about being stabbed in the back...
With all those drawbacks combined... well, no wonder Teacher Tobirama had sealed away [Impure World Reincarnation].
This technique was meant for emergencies. If Konoha faced a major crisis, they could haul the previous generations back up to drive off the invaders.
Or it could offer comfort to the living. If those left behind missed someone unbearably, they could summon the deceased, reminisce, have a chat, and then release the technique.
(Death-row prisoner: Show me some respect! My life is a life too!)
Looked at that way, despite requiring a living sacrifice,