... preseason work, it is that they have good depth at the game's most important position.

With the style of play that starter Ben Roethlisberger has adopted in his NFL career, depth at quarterback is even more essential for the Steelers. 

Roethlisberger frequently holds onto the ball too long and moves out of the pocket to make plays.

While this has brought the Steelers a great deal of success, particularly behind one of the league's more suspect lines, it also opens Roethlisberger to more hits and, therefore, more injuries.

Behind Roethlisberger, the Steelers have two talented backups.

Charlie Batch, among the oldest Steelers, is the steady veteran able to step in for Roethlisberger when necessary.

Secon...

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