The last time we heard the question about something standing in the statue's shadow was when Lapidus returned from the main island and got ambushed by the 2nd generation of Losties (aka Flight 316). What you (and I) may not have realized is that the main abductor who tried to dissuade Miles in the van was actually a passenger (Bram) on Flight 316. Now . . . was it a passenger who went back in time after crashing on the island or a passenger who had yet to make it to the island? Well, that's impossible to know at this point, but something tells me that dude had already seen the island.
We also know these people are anti-Widmore, which leads me to believe they're pro-Ben. They seemed to act completely differently after Lapidus returned from escorting Sun to the main island in contrast to the way they acted before he, Sun, and Ben all left. What changed their minds? My guess is, it had something to do with the psychosomatic smoke monster (heretofore known as PSM). I have a feeling that Ben reunited with the island and perhaps dabbled in yet another bout of time travel to brainwash the survivors of Flight 316. It's a wild guess, but I'm stickin' to it.
Another question was how Daniel Farraday could reappear 30 years ago after disappearing. Well, I believe he left the island when Sawyer, Juliet, Miles, and Jin all joined the Dharma initiative. I don't know how he did, but he did. Regardless, I think Daniel has always been linked in time to Sawyer, Juliet, et. al. So it's no surprise he recognized Miles. To us, they are all their present-day selves in a 1970's setting.
And what about Miles being Dr. Chang's son? Well that just makes good sense. You'd have to believe Miles got his extra-sensory post-mortem communication abilities from being born on the island (or from the after-effects of what may have happened during his time there).
It's all so very cool and, if you don't watch, so very dorky. I can't wait to watch!