Black Zetsu's judgment could not be called wrong...
Because it truly knew how difficult it was to control the Ten-Tails.
However, once Black Zetsu revealed that Uchiha Obito already had the means to resurrect the Ten-Tails, there was no longer any point for Emiya Shihara and the others to remain in Konohagakure to capture the Nine-Tails.
Chapter 200