Why does Heathcliff (Kayaba) smile at the end in episode 14? In episode 14 of SAO, at the 14th minute mark:


   Kirito kills Kayaba.  He did not try to stop Kirito, and died smiling. Was he waiting to be killed by Kirito?


Did Kayaba expect it?
If I remember correctly it's never said. But it's probably to do with the fact the Kirito defied the system, as Kayaba does mention something similar in the final episode of Season 1.