Kimimaro Kaguya—or rather, Kimimaro of the Kaguya Clan (back when I was in middle school, he was still translated as Kimimaro Kaguya)—was an exceptionally valuable talent.
First, his name made him seem like a direct descendant of Kaguya Otsutsuki. Second, he possessed considerable skill; despite being gravely ill, he had nearly killed the One-Tailed Beast's Jinchuriki. That alone put him firmly at Jonin level—and this was still three years before Shippuden. It was hard to imagine how powerful he would have become three years later if he had not died.
Besides, even if a disease could not be cured, merely identifying it was already a discovery. With so many Reincarnators around, they would surely be able to find a solution.
Oguri Hayashi already had a mature plan in mind for dealing with Kimimaro Kaguya's illness. In the future, he would certainly become a powerful and dependable fighter.
As for the other ordinary children, that was purely Oguri Hayashi's saintly compassion. Those foolish Kaguya Clan adults could rebel if they wanted, but the children were innocent. Since Takigakure's forces could not stop the Kaguya Clan and the Mist Ninja, Oguri Hayashi could only choose the gentler plan of taking the children away.
Watching the Kaguya Clan's ninja army march grandly toward the battlefield, Oguri Hayashi waited a moment before issuing the order.
"Begin the operation. Remember, make sure the entire village hears you. If guards resist, take them down. Do not kill unless absolutely necessary. It would be best if you could get the women and children to bring their own kids over." His words still rang in their ears when they all charged out.
Ninja had to expend a great deal of Chakra to maintain their bodies at a ninety-degree angle while climbing steep cliffs. That was why Stone Shinobi