Why Others didn't move into Dharma houses?

When I was watching "Dead is Dead", I began to wonder why the Ben and the others hadn't had moved into the Dharma houses when we saw Ben kidnapp baby Alex. If Ben had killed all of the Dharma already and he had become and other, wouldn't you think they would've moved into the Dharma houses then? Then we see Ben at the Dharma houses pushing Alex in the swing. I am just curious why they were still living in jungle when all of the Dharma Initiative was dead. Any ideas?

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