#4 Punk is reportedly hard to work with
There are several stories about Punk being hard to work with. He became possibly the biggest star in WWE following his Pipebomb promo in the summer of 2011. Punk wanted more, and his goal was to be featured in the closing match of WrestleMania.
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On one occasion, Punk teamed up with Chris Jericho to take on Edge and John Morrison in Canada. Throughout the course of the match, Punk didn't tag Jericho in, and this didn't sit well with the latter. Things got ugly pretty soon after the match was done and dusted with. Jericho confronted Punk in a backstage area, with his argument being that fans might have paid to see him in action. This was just one of several incidents that prove that Punk could be difficult to work with on some occasions.