It would be nice to see CM Punk finally returning as the new member of The Shield.
- Rollins was the "architect" because, apparently, he's smarter than Reigns and Ambrose;
- CM Punk has already had what... 2 Stables? (SxS and The New Nexus), which he was the leader;
- CM Punk's situation could be used Storylinewise. He's always had "problems" with the Authority almost in every storyline.
Among other names... Sami Zayn, Prince Devitt or Dolph Ziggler would be some of my picks... Oh or Christian if he's still able to wrestle.
... there's also JTG.