Not to try and bring this back up, but Angel is spot on. These are just movies which happen to have had a LOT of (contradictory) supplemental information written for them because George Lucas is a marketing genius.
For the OT, they are unnecessary, we know everything we need to know just by watching.
For the PT, unfortunately, they are because it's so badly written and nothing makes sense.
Ady is editing them as self contained movies so anything outside is irrelevant.