Some people subscribe to the view that a student is defined by their teacher.
They believe that the student cannot exceed the teacher.
This is a 'lineage' approach and amusing when you consider people such as Einstein or Mozart.
Clearly Einstein exceeded the sum of his teacher's expertise; he is considered to be one of the most powerful thinkers of all time...
What was his physics teacher called?
Every good teacher wants the student to exceed their own limitations.