Jinguuji thinking of Tachibana?
Perhaps this is the problem of some serious people, the "directives"
Some capable people, who are high achievers, are commonly following instruction to others.
In case of Jinguuji, he follows tachibana, because it might he has boredom all the time.
With him around Tachibana, he can observe, and observe, and observe, and watch, and he doesnt know himself that he was being entertained, and or being instructed to follow him and do something if there's trouble ahead...