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With better O-line play, Vick's interceptions should go down. But the biggest problem with Vick's play has always been his tendency to fumble the football.
Vick had a whopping 11 fumbles in 2012, 10 in 2011, 11 in 2010, nine in 2006, 11 in 2005, and 16 in 2004. Fumbling is a part of the player he has been for his entire career, and old habits don't die easily.
While Vick has been carrying the football seemingly more securely in the preseason, it remains to be seen if he can secure the ball just as effectively during games of consequence, when defenders will punish you for leaving the pocket.
One play from 2012 immediately comes to mind. At the goal-line, a quarterback draw was called, and Vick had what appeared to be a clear path to the end zone. It looked like a sure touchdown—but before Vick could cross the goal line, Steelers safety Ryan Clark knocked the ball out of Vick's hands, and it was recovered by the Steelers to end the drive.
Vick made a strong effort to protect the ball, holding it with both hands, but ball security is simply not one of his strengths and he fumbled it anyway.
Reports have indicated that Vick has finally learned how to properly hold the football this offseason, but he will have to prove it in the regular season against defenses who will specifically game-plan over how to strip it from him.