FILE - This combination of 2012 file photos shows, from left, Denver Broncos quarterback Peyton Manning on July 27, New York Jets quarterbacks Tim Tebow (15) and Mark Sanchez (6) on July 30, New Orleans Saints players on July 27, official Shannon Eastin on Aug. 4, Chicago Bears quarterback Jay Cutler, left, and wide receiver Brandon Marshall (15) on May 23 and Indianapolis Colts quarterback Andrew Luck on July 31. The Associated Press examines six of the top questions that will be answered as the preseason begins on Thursday, Aug. 9. (AP Photos/File)

Associated Press
FILE - This combination of 2012 file photos shows, from left, Denver Broncos quarterback Peyton Manning on July 27, New York Jets quarterbacks Tim Tebow (15) and Mark Sanchez (6) on July 30, New Orleans Saints players on July 27, official Shannon Eastin on Aug. 4, Chicago Bears quarterback Jay Cutler, left, and wide receiver Brandon Marshall (15) on May 23 and Indianapolis Colts quarterback Andrew Luck on July 31. The Associated Press examines six of the top questions that will be answered as the preseason begins on Thursday, Aug. 9. (AP Photos/File)
FILE - This combination of 2012 file photos shows, from left, Denver Broncos quarterback Peyton Manning on July 27, New York Jets quarterbacks Tim Tebow (15) and Mark Sanchez (6) on July 30, New Orleans Saints players on July 27, official Shannon Eastin on Aug. 4, Chicago Bears quarterback Jay Cutler, left, and wide receiver Brandon Marshall (15) on May 23 and Indianapolis Colts quarterback Andrew Luck on July 31. The Associated Press examines six of the top questions that will be answered as the preseason begins on Thursday, Aug. 9. (AP Photos/File)
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