I remember thinking the same thing. "We've heard that before!" It was like a chill ran down my spine.
I think it is very posible that Dharma inplanted Dave in Hurley's head. It's as simple as hypnosis. I would say Dhrama is more than capable of doing that.

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Hope is a very dangerous thing to lose. - Sayid

I do what my Rice Krispies tell me to. - Anonymous