you already know all of the things that I will say?

If I'm an English teacher and I put more emphasis on math, science, history, and geography, than I do on English, or even religion, you don't see how that might have an effect?

You know very well that as soon as those students start underperforming that teacher is going to be under some intense scrutiny and criticism for their teaching methods.

What if I was a different English teacher who focused only on English?

What's not to understand? You're spending time & energy and focus on things that should be spent on football and you're setting the wrong tone.