I just don't like the "someone/group staged a fake plane wreck" idea. Sure it is plausible although I think very unlikely. But aside from that the bigger question is why?
To me the only reason to fake a crash site is to get someone to stop looking for Flight 815 and to protect the island's location. Flight 815 is supposed to have lost comms and was a 1000 miles off course when it crashed. The island is supposed to be very difficult to find. (even though several planes and ships have crashed there)
So is it really that big a concern that someone looking for flight 815 would find the island?

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?