What the hell can that mean?

I've been thinking a lot guys, about the fact of two sets of Others. We saw Goodwin and Ethan take off after the crash sites, yet Jack is in the woods and a flashlight is next to his head. I've checked this several times, it def is one of the flashlights. We know people weere dragged off and Eko killed people in the second season pilot, but it wasn't Goodwin. Who are these other sets of people, are they more dangerous, and who will the losties really tangle with.

I'm sorry, but I'm having the DT"s I can't wait a month!