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Doesn't follow. Bell curve in, shifted bell curve out. Ideally this also tweaks the variance a bit.

In other words: Some students flourish despite their teachers, some flourish because of them.

And how would you call the students in the left tail of the Bell curve if not bad students?

Below average students and as long as the average is high enough they are still very competent.

A bad teacher instead gives you a bimodal distribution and just doesn't bother teaching those students.