Cardinals coach Ken Whisenhunt made it clear before the season that Hall could factor into the team's plans sooner rather than later. That became apparent when the Cardinals released Matt Leinart and named Hall the No. 2 quarterback behind Anderson.
Anderson has struggled with accuracy and consistency, save for a strong fourth-quarter effort against St. Louis in the opener. The Cardinals liked what they saw from Hall during the exhibition season and thought he had a chance to develop into a starter.
The current state of the NFC West allows the Cardinals to play an undrafted rookie quarterback without necessarily giving up on the current season. Of course, nothing prevents Whisenhunt from going back to Anderson later in this game or later in the season.