well you can take yer freytigs pyramid and shove that up frinks arse an all! as i dont see a director having a "Freytig" moment to say "Hey everyone lets pause here and see how what we've done compares to Freytigs triangle! ....oh.....uh.....mmmmm ok this movies a disaster....its doesnt work! ---- ok maybe thats what GL SHOULD have done when he made the prequels but otherwise its just high-school textbook carp that you've read and think oh cool maybe i can sound like i actually know something and make someone else look like the idiot for a change....lets make movies that fit this line of incidence graph or whatever........carp!

And no Darth Vader has no character development other than at the end of return of the jedi where obviously his character does change once he saves Luke from the Emperor. Its contamination from the prequels thats clouded your judgement! I don't class what he says to Luke at Bespin as character development - since you can't tell if he's telling the truth or not, it could be just an evil ploy to sway Luke to the Darkside! - Its character development for Luke, sure, as it has a big impact on him!- but Darth Vaders only ever on screen for a few minutes each time, says a few lines and then its back to the rebels again. Thats not the kind of role that would class as "Main Character or worthy of character development" - Any character development for Darth Vader has only come from the prequel movies.

Darth Vaders character development during the OT:

(below is just clarify that there is no character development for the big DV!...his role...beliefs do not change throughout the movies)

Star wars - Start's evil - end's Evil (plus looks a bit stoopid spinning around in his ship untill infinity!)

Empire Strikes Back - Start's Evil, End's Evil! (yeah see how you like it rebels!)

Return of the Jedi - Start's Evil - 15 mins before finale - Ends Good.