Re-watching Lost reveals lots of surprised. The first time through, I assumed that the first time we see Sawyer as "LaFleur" is in the 5th season episode of the same name. However, rewatching the season 3 episode "The Man Behind the Curtain" reveals just a glimpse of Sawyer/LaFleur running past the school room as young Ben Linus watches. What does this mean? It means that Sawyer, Miles, and Juliette's existence on the Island back in the 1970's was and has always been part of the Island's timeline.