Moriyue was like a walking organ replicator. More specifically, he used his tentacles to replicate numerous human organs. Without any particularly potent means of recovery, this was hardly a normal solution.
Yugito Nii's main injury lay in having her Tailed Beast extracted. After Moriyue transplanted the Tailed Beast fragment into the Two-Tails, her condition might not improve much, but at least it should not continue worsening.
With that prerequisite in place, the subsequent procedures became much easier. He took out the medicine previously used to keep Nagato alive. He had not used it before transplanting the Tailed Beast because, given Yugito Nii's condition at the time, it would have been useless.
After the Tailed Beast had been extracted, all her vital signs had plummeted. Even if he had administered those medicines, they would not have produced much effect.
Unless it was a reincarnation-type resurrection ninjutsu, ordinary healing methods were completely useless. That was why most Tailed Beast Jinchuriki died on the spot after losing their Tailed Beasts.
Seeing the most difficult problem resolved, Moriyue finally breathed a sigh of relief. From here on, he only needed to follow the procedure. If nothing unexpected happened, Yugito Nii's life should be saved.
Orochimaru had been extremely quiet during this time. He did not say a word, like a scholar silently taking experimental notes. He had conducted similar research into the medicines Moriyue had produced, but his attainments in pharmacology were clearly inferior to Moriyue's. After all, Orochimaru had plenty of ways to recover; at worst, he could simply change bodies.
But now that he had seized Sasuke's body, he could no longer switch bodies whenever he pleased. He still needed some medicine to treat injuries.
Moriyue's display of pharmaceutical expertise had happened to show Orochimaru another value of his good teammate. It