#3 Seth Rollins
The Shield may be over, but that doesn't mean there still can't be stories told surrounding the two members who are still with the company. Seth Rollins should be right at the top of the list of targets for CM Punk if he makes his return to WWE.
This isn't just about the WWE Universal Championship either. Sure that would be an added bonus for Punk, but this is a match-up that doesn't need the title.
Don't forget the Shield debuted at Survivor Series 2012 and helped CM Punk retain his WWE Championship. They would serve has his mercenaries for a while, before the two sides eventually had a falling out.
A lot has changed since then. Punk left the company in the early part of 2014, and each member of The Shield went on to successful singles careers. Fast forward to today and Rollins, in particular, is the top-dog on RAW. He's the reigning Royal Rumble winner. He's a multi-time Universal Champion. He's also been the social media warrior for WWE this year.
Maybe Punk would have a few things to say about that if he is given the chance. He is after all the self-proclaimed Best in the World. Punk returning to take on his old protege is just good storytelling.
Not to mention that Rollins is, in fact, one of the best wrestlers on the planet. Even if Punk is only half as good as he used to be, it should make for a great match up.