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Simple logic dictates that a teacher that cannot communicate effectively with the students cannot effectively teach any of them. The same applies the other way, a student that cannot effectively communicate with their teacher can't learn what they need to know, (assuming the teacher is competent in the subject and a competent teacher).
And reality is those that can teach effectively in the language of the educational institution know that they can make money elsewhere. So many schools end up with what's left over. Right now, the school I'm at has been letting some of the contract profs go or the contract profs have left for better pastures (work with a real job) because they don't get enough funds to keep profs on and some of the ones they have the students hate because of an inability to teach.