It didn't hurt Matt this year.I think it does. All the time Kyle spends in Nationwide and Trucks, which is far more than anyone else, is time spent away from the Cup car and team. It's very common for Kyle's team not to be on the same page he is and I suspect that's because Kyle's off running another race.
Once a driver makes the Chase, they should step aside from running Nationwide and Trucks and focus on the Cup cars. It takes 100% to compete in the Chase. I don't think Kyle gets 100% by running the minors.