I think there are definitely viewers giving Ben more credit than he deserves on manipulating certain events on the island. However, I do believe Ben is a puppet master and at least attempts to maintain a certain level of control over everyone on the island. I don't think he is infallible, but he seems to be quite capable of reacting quickly to changes and makes adjustments to his overall plan as events unfold around him. He also seems very able to seize opportunities as they arise. Such as Locke showing up to destroy the sub. Allowing him to keep his word with Jack and still keep him from leaving the island

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?