Have the Dolphins found their quarterback?

Yes, they have. I believe in Chad Henne, and I think the Dolphins' brass do as well. He fits the Bill Parcells mold extremely well. He is tough, intelligent and built well to take a pounding. He has a very strong arm and will threaten a defense at all levels.
At this early stage of his career, he can act as a game-manager-type behind a good offensive line in a run-first offense that can control a game on the ground. But Henne is more than that, and he will only get better. In the final five games of the season, Henne eclipsed 300 passing yards three times. However, in his last six games, he did throw 10 interceptions -- far too high of a number -- but he also attempted 233 passes in that stretch, which isn't the Dolphins' recipe for offensive success. Remember, this offense is devoid of pass-catching difference-makers, which put a ton of stress on a first-year starter behind center.
Henne enters this offseason as the clear starter, and that preparation time should do wonders. Now it is on Miami's personnel department to get its promising young signal-caller another viable weapon or two.

he did throw 10 interceptions -- far too high of a number -- but he also attempted 233 passes in that stretch, which isn't the Dolphins' recipe for offensive success