You could see right away that Kett just didn't have it today. It happens. Similar to a good goalie just not feeling it, he needed to be pulled early on. His body language was terrible and you could tell he didn't really want to be on the field. He slowly got up after each hit, hobbled a bit like he might pull himself out injured, and then when the coaches took no notice he trudged back to the huddle.
The fact he was left in is hard to understand. Bubba too nice to overrule Rudy and Rudy too far from the field to see what's in front of him?