Becoming Yanbai's disciple meant not only paying tuition, but also studying a great deal that had nothing to do with ninjutsu.
Only then would Yanbai teach them ninjutsu and taijutsu that were "suitable" for their individual circumstances.
These days, Yanbai dealt with his routine administrative duties first thing every morning, then began teaching.
From the very first day, Yanbai had been assessing the talents of the five juniors before him.
For seven consecutive days, Yanbai taught them no ninjutsu, instead continuing to assess them as they studied written material.
After those seven days, Yanbai hardly knew what to say about Hyuga Yuisaki, the student sent by the Hyuga Clan.
When it came to learning taijutsu, Hyuga Yuisaki was certainly talented, but when it came to studying management, he was a stubborn mule...
Actually, calling him a stubborn mule wasn't quite right. Hyuga Yuisaki was more like a puppet.
When told to study theory, Hyuga Yuisaki learned quickly and remembered everything accurately, but he couldn't adapt.
Whatever Yanbai said was the absolute truth.
Even when it was wrong, Hyuga Yuisaki had no thoughts of his own.
Hyuga Yuisaki was a robot that followed orders to the letter.
All Hyuga Yuisaki had to do was obey, never asking why.
Reasonable orders from Yanbai were training; unreasonable orders from Yanbai were trials to temper him.
In any case, no matter what Yanbai said, Hyuga Yuisaki would follow it to the letter, even if he couldn't understand it.
Whatever Yanbai told him to study, he studied.
This left Yanbai utterly speechless.
In Yanbai's view, someone as unquestioningly obedient as Hyuga Yuisaki would make an extremely useful subordinate, but he wasn't suited to being a manager.
A Hokage had to be adaptable.
The future was unknown, after all. Nobody knew what unforeseen changes might arise.