Kolb struggled to recover from 2011 concussion

If Cardinals quarterback Kevin Kolb was surprised by the team’s interest in Peyton Manning, he shouldn’t have been. First, they were pursuing Peyton Manning, not Tim Tebow. Second, Kolb hasn’t played well enough to earn guaranteed placement atop the depth chart. And, third, Kolb’s struggles with concussions necessarily have the team concerned about his durability.…