About Vader vs Obi Wan, I think Sidious worrying about Vader being conflicted was intended by the authors to calm down all the inevitable power levels talks. Kenobi was surely conflicted as well, but Vader commented on him finding his vigor again, and especially after Vader buried him under that pile of rocks, thinking about Leia and what he had to protect gave him the focus and determination to pull him off. If Vader was supposed to be at 100% against his master the authors would have left so many clues that he wasn’t