Just rewatched Orientation last night and what a great episode. Of course any Locke episode is great. I love the ending when jack and locke are arguing about faith. It seems like the last few minutes represents the series as a whole. They have to push a button for a reason but Jack is in denial and refuses to believe it. So John has to convince Jack to do it with time running ticking down. I feel like that is the show in a nutshell. John had to convince Jack they were on the island for a reason. the timer ticking down is representative of the time remaining before Jacob and all the candidates are dead. I love when John says "It has to be you Jack". God i love this show.