I just don't like the idea of Jack working with the others. It just doesn't sit right with me, seems too obvious. Especially since the losties are having doubts with him.
He doesn't really seem to be acting that different to me. Just cause there is time spent with the others we didn't get to see it gets the mind to wandering, but I think he is the same old goofy Jack.

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