You don't know how important a backup quarterback is until your starter goes down. In that case, the quality of the second-string passer can be the difference between a failed season and a playoff appearance.
The Jacksonville Jaguars currently have Nick Mullens as their backup QB. Mullens has been around the league for a while, but his 5-15 record as a starter shows there's plenty of room for improvement at the position.
After the New York Giants' latest depth chart announcement, a new option may be on the table.
Jaguars could trade for Jameis Winston after QB falls on Giants' depth chart
Jameis Winston has more than enough experience to be a capable backup QB.