RicOlie_2 said:
And of course you should use the repetition gag for that--you could have him show up throughout the movie. You could make it so that Darth Vader doesn't kill Obi-Wan, Obi-Wan is still up on the tower pulling levers. So Obi-Wan would die when Luke blows up the Death Star.
Or instead of Luke blowing up the Death Star, the last lever Obi-Wan pulls could blow it up instead. Or instead of impacting on the surface, Red(?) Leader's shot could blow it up.