Because we know that. Whether the characters do is irrelevant.
No, I'm not it was revealed in RoW.
That makes no sense.
Every time we saw him he revealed new knowledge, but the prologue shows that everything we saw was the ONLY things he knew that were correct. If that isn't a complete 180 I don't know what is.
Both of those are wrong, none of the scientists were killed by Szeth, and Gavilar says that Thaidakar only provided knowledge. So even if you accept the prologue that's not true.
That's exactly my problem.