According to the Wrestling Observer, they are keeping Punk with Ryback on tour "because they still want to keep Ryback working with Punk to help teach him in-ring skills."
Wow. Talk about a sign of the times. The #1 contender to the biggest championship in the business is getting to wrestle the champion so he can improve his ring work.
Remember when the challengers actually deserved to be in the ring with the champ?