Kolb has to prove he is worthy of being a starting NFL quarterback. He's had ups and downs in stops with the Philadelphia Eagles and Arizona Cardinals. Now, Kolb will be part of a three-way competition with Tarvaris Jackson and rookie EJ Manuel. If Kolb is worth his salt, he should beat out a career journeyman and a first-year quarterback still trying to learn the NFL game. Kolb has the most experience of the three, but he's also been inconsistent and prone to injuries.