Henry could very well still be one of the others. There was a crashed plane on the island, why not a balloon too? If the group hadn't already found that plane, Henry could've just said he was flying drugs out of africa and his plane crashed. He'd lead them to the plane and they'd find the drugs and believe he was telling the truth. I'm sure the others are very aware of what is on the island, and they will use it to their advantage. Finding a balloon doesn't necessarily mean he's innocent.
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