The kidnapping of Kate and Sawyer

Does anyone know exactly why Kate and Sawyer were kidnapped by the others at the end of season 2. Danny Pickett said that their names were on a list. After being brought to the hydra island all they were made to do is help in making a runway and imprisoned in cages.It doesn't really seem that Jacob would send the others a list with the names of candidates so that they would be made to do such things. What was the actual purpose of bringing them to the hydra island?

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