3) Also, Danielle has been there 16 years...the "others" who took Alex had been there even longer according to her. At most, the Dharma project has been on the island for 25 years (the film was made in 1980).
How long had Hurley's friend in the psych ward been back from the service? Hasn't it been 16 years, which would coincide with Danielle's arrival? I wonder if Hurely's friend and his deceased partner were really in the hacth at some point, and their military background is just a cover.....