Ten years was quite a lengthy amount of time.
But for some patient schemers, ten years might not seem that long.
Now then, how likely did it seem that the Tendo Family had begun a scheme related to the Realm of Cherry Blossoms ten years ago?
It seemed unlikely. It would be almost impossible to predict the general situation ten years down the road. However, it would be more probably that the Tendo Family had left a trap that could be activated later down the road at an appropriate time.
People commonly had misunderstandings about what schemes were. Many would believe that schemes would be well-concealed and intricate from the very start. Or, at least, that the scheme would be relatively well planned, and that it would secretly proceed until it finally succeeded.