okay this isnt really a plot hole but i was watching an interview with George Lucas yesterday and he said that during the time of ANH release he already had the whole story written out as well as the back story... but he knew he could only make this one movie so he decieded with the timeline of ANH...

now if he is telling the truth and knew the whole story of Star Wars then that means he knew Luke and Leia were brother and sister...
so if that is true then why in the hell did he allow them to kiss in ESB??

i think Lucas is bullshitting...
my opinion is he wrote ANH realized how much of a success it was... then wrote ESB, got more money and figured hell, why not make another, hence ROTJ..

what do you guys think?