I would say that Lucas would at least give some frame of reference before trying to pull off such an incredible leap. He would have included at least a small scene of Rey actually reading the Jedi books ( You put forward earlier that she had the books and therefore learned the ability which means any Jedi can learn the ability, not restricting it to a special few) and putting something from it in to action, some form of practice or experiment to show the audience there is a foundation to this so yes, I probably would have bought it. Hypothetically.
Its entirely irrelevant if the end of ROTJ had an ending with Ben and Yoda helping Luke because it didn't happen. No one makes a film connected to the Star Wars universe with just one draft.....oh wait
Correct, that was a typo as Vader was the topic at the time, I meant Obi Wan. I feel once we get into the raising of the dead territory or mystical healing, applying recognized medical principles to their application kind of become redundant. Technically Padme was exposed to a constriction of her airways that rendered her unconscious which may have escalated other issues involving a heavily pregnant woman. Point is, there was more than enough motivation for Obi Wan to at least try and save her seeing that the father was either dead or dying in his mind if this power was at all available to him, a Jedi Master.