After the upset loss to Temple earlier in the week, Coach K was sure to tinker with the lineup. In a not so shocking move he has inserted Quinn Cook into the starting lineup. This isn't a shocker at all since Cook is Duke's only point guard who can be a solid contributor on both sides of the ball.
The young Chris Duhon type of player is destined to be the new four-year Duke point guard who will benefit the most from K and his coaches over time. He may not be as skilled as someone like Kyrie Irving, but he will be a force for Duke in the future.
Throughout this season, Cook has only scored 5.1 points per game in his reserve role. The game is only five minutes in and Cook has already passed his season averages so those numbers are sure to inflate if he keeps the job. His season high sits at 16, but don't be surprised if that gets eclipsed in the very near future.
It is uncertain if this is the key move that Duke needs to make to turn the corner, but time will tell. The move does show that Coach K is not happy with the production of Tyler Thornton. Thornton may have lost his starting job, but he will still play an integral part as Duke makes the push into conference and March.