Spanish kids with little english knowledge are often sent to english speaking schools. Bilingual education and research orginates from that situation. The field of deaf education have borrowed a lot of findings from the spanish-english bilingual situation.
From personal experiences and reading research on the spanish-english bilingualism, I know that your ASL teacher would be fine as a teacher, and research can support that he in some cases even is prefered for teaching english, over a teacher fluent in english.
Could you clarify this for me? In my mind, you're talking about bilingual education, but it really sounds like Spanish kids speaking Spanish at home and speaking English at school. (Correct me if I am wrong) This is EXACTLY how my family is raised for in my generation (and the next, oh god, Im old). All of my cousins grew up speaking both English and Spanish. However, they all go to schools that have English ONLY. If their teachers spoke Spanglish, I don't see the point of sending them to school to teach them English?
It seems like a lot of people are thinking about little kids when it comes to ASL teachers with bad English. Yes, they don't need to have a good English. It's only their ASL that matters. They can teach in most, if not all, subjects.
However, I am thinking about the OLDER kids. My middle and high school experience involved a lot of textbooks (Science and History), books (Literature), essays, reports, and so on. Maybe it's just a different experience in a ASL-infused school.
Your 1 and 2 question is controversial. It looks like you are discrediting hearing teachers, and putting lousy deaf teachers over good hearing teachers. I'm fine with your questions, but I'm not sure if the majority dare to hear the answers to your questions.
Well, generally, deaf people have a better command of ASL over hearing teachers. And someone already mentioned that a deaf school has superior results because most people who work there are deaf. And I said nothing about replacing hearing teachers with lousy deaf teachers. In fact, I DON'T want lousy deaf teachers, or lousy teachers, period. I simply added a question at the end about a deaf teacher with bad English because I was curious.