I have a theory:
I think there is 3 parties on the island. The others, Dharma folks and the losties. The others where on the dharma observe project but found stuff out that made them stand up against the Dharma folks. Dharma project still have the losties in the project and the others took their leaders away to get better/stronger for a rise against the dharma folks.
Libby looks like she could be a agent that recruit people for the Dharma project.
The other losties left at camp+Hugo are still in the project and the others don’t want the Dharma folks to end the project. Well the others have contact with the outside because the boat uses fuel and the used advance methods of catching them.