If anything it's the PT that have hidden or ghost writers, Carrie Fisher and Tom Stoppard apparently contributed to the PT.

The scriptwriting credits for the OT if anything point the opposite way giving him less credit than he could claim (though he didn't write the novelisation credited to him that was Alan Dean Foster).

I've been thinking about the prophecy regarding the chosen one.

I know this is seen as unpopular to some people but I think it's one of the elements that don't work because of it's execution.

I loved the way that the television adaptation of I Claudius uses the Delphic prophecy to bookend the series and I also like the idea of assuming that a prophecy points one way when it may point in the opposite direction.

A scene where we see an ancient recording of the prophecy being played before the council and some of the council like Dooku and Qui-Gon reading portents in events like the invasion of Naboo could sell the idea better and sow the seeds of doubt that Palpatine would later exploit.