Dragging thing

I still don't understand why The Others started to drag people (not the kids). In "The Other 48 Days" we see they dragged 9 of them (2 kids). Goodwin said they took all the strongest guys, atletic, tough, threats. So why didnt they take Jack, Sawyer, Sayid then? Then Goodwin said that Nathan was not a good person, and thats why he wasn't on the list. So if they were taking good ppl, why didnt they take Locke? :s. And what happend to those guys they took? They became one of them or what?

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