Dharma are the others
I watched the latest episode last night and it just gets better.
Something that crossed my mind was when Mrs Hawking stated that Dharma built the lighthouse to find the island. She didn’t say to find a island but the island. To me this means that Dharma already not only know of the island but also its specialness. They built a machine to find it. For them to know the island is special and that it moves in space/time could only mean someone from Dharma had been their before