Wan was killed off so he  wouldnt have to appear in any sequels or Lucas did it on his own  much to the bitterness of Guinness. In the Episode IV DVD  Commentary, Lucas says that he felt it was a waste of Guinnesss  talents to have him stand beside Leia in the control room during the  Death Star battle (as it was scripted) and too outlandish to have  the elderly Obi