Aquila,
As per the
John 9 story:
It is possible that the Jews might have had a reasoning about someone being able to sin before they were born. But we also know that the Jews did NOT know all about the workings of God.
For example, the saduccees did not believe in ressurrection, while the pharisees did. So I would say instead of trying to go with what the Jews "believed" based on their limited knowledge of God, let's stick to the bible where it says it's appointed to man to die once.
As per the Elijah scenario, I can see what you're saying. However, we have to recognize that Elijah NEVER experience death. So, considering the fact that Elijah did NOT die, then we can't really call it re-incarnation.
But in the end, this is just speculative:
Rom 11
33 O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!
34
For who hath known the mind of the Lord? or who hath been his counsellor?