#3 AJ Styles

CM Punk and AJ Styles had a brief feud in Ring of Honor during the early 2000s. Since then, they have gone their separate ways as AJ became the face of TNA while Punk eventually reached the top of WWE. For years, fans wanted a match between them, but it never was meant to be as AJ made his WWE debut two years after Punk had quit.
Therefore, if Punk returns, AJ should be one of his first feuds. Both men are great inside the ring and have enough prowess on the mic to put on an entertaining feud. It's a smark dream to see an extensive feud between these two guys, and casual fans are fond of them as well. So, it is sure to be received well by the fanbase.
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Things would have been undoubtedly better if both men were in their prime, but the ship has sailed on that. However, it should still be a great rivalry.
#2 Kevin Owens

A lot of people say Kevin Owens is the closest thing in the current WWE roster to CM Punk; if not in terms of their in-ring style, then definitely in terms of the similarities in mannerisms and character. Both guys can play the role of babyface and heel; they're both very honest and brutal; we've seen them both cut great promos, which had the crowds involved. Simply put, a feud between Punk and Owens is a must-see and will be entertaining.
To propel the feud, WWE would have Punk acknowledge all of the wrestlers in WWE who made a transition from the indies and mention that he was one of the first to do so. Owens can interrupt him and acknowledge all of Punk's contributions to WWE, but then throw them all down the drain by stating that he quit.
Owens can bring up the fact that Punk's not needed anymore in WWE, which will set the tone for the whole feud. It will be electric and a great way to bring Punk back to the fold.
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