With two of the best running backs in the NFL and an outstanding offensive line, the Vikings are clearly an unbalanced run first team.  One of the major requirements for a quarterback is to continually threaten to throw the deep ball.  This threat prevents the opposing defenses from running all of their players at the line on every play.  This was the reason that (WR) Bernard Berrian was acquired.  He can stretch the field., but he needs a quarterback that can throw the deep ball.  I understand that due to injuries that while Pennington is quite accurate, he is not a deep ball passer.