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Manziel is currently the leading rusher in the Southeastern Conference with 922 yards through seven games. He is like having an extra running back on the field.
Manziel has everything that a great running back has. He is elusive, breaks tackles, and has great vision and elite speed. Manziel has consistently used his sub-4.4 speed to outrun the angles from SEC defensive backs this season.
On his 37 yard touchdown run against Mississippi State, Manziel showed off vision and speed when he cut inside an Aggie wide receiver who should have blocked the Bulldog safety. Manziel read the position of the receiver and so cut inside.
The receiver missed the block, but Manziel simply outran the safety anyways.
Alabama runs a 3-4 defense. They will likely run a lot of nickel schemes against A&M with an extra defensive back on the field to help cover all of the Aggies wide receivers.
If they go to their nickel, they could have three down linemen and only two linebackers in the box. That means that they would have five defenders to go up against the Aggies' five offensive linemen. With no one to account for Manziel it could mean a long day for Alabama.