Individuality

In a Japanese martial art the syllabus is very clear cut.
Every student works through the same material, learns the same kata and the same applications.
Yet, higher dan black belts express the art differently to one another.
How come?
The Chinese language uses pictographs to express ideas and these form the basis of their language.
All Chinese students learn the same set of pictographs yet these are pronounced differently relative to dialect/cultural background.
In Japanese martial arts this is why higher dan all express the same art individually.