I think this is correct. Please remember that all these things are speculative to some extent and the evidence is often ambiguous. Historians usually have to deal not with hard proof, but with a balance of probabilities. You may be assuming more than you have a right to here. See my opening remarks.
Many scholars think so.
Your opinion only. Certainly I've come across this claim. I don't follow your logic. In Jerusalem, these texts were Hebrew. That's what most people think.