1. There's a lot more that plays into a outside scoring situation than just the jump shot and jump shot ratings.
This.
Offense is not simply about the jumpshot skill. Jump range will effect how much impact the distance of the shot has which is obvious, but the team's passing, and the passing skill of the player who threw the pass to the player matters, as does the shooter's driving skill. You also need to factor in each players' game shape and experience plus each teams' enthusiasm and effort and home court advantage.
Furthermore, I also suspect (but have no proof) that the defending team's overall OD has an impact on all shots to some degree, not just the defense of the player guarding the shooter. (by this I mean that team defense obviously impacts flow which would have an impact on shot quality, but I also think that overall OD has an impact on the calculations of the shot itself)
So I don't think there's an easy answer to the original question and I am not sure if it is even the right kind of question to be asking when thinking about the game. The pressing thing to try to understand, in my opinion at least, is how the various offensive skills work together to produce shot quality. (for the record, I am no where near being able to understand it)