Uhhh.... On his Instagram, John Cena posted CM Punk’s twitter avatar. Recently Cena posted a photo of AJ Styles before his debut in WWE. Cena most likely posted the photo to mess with his fans. To get an understanding of how Cena uses his Instagram you can read his Instagram bio below. You can also see the post below: John Cena (@johncena) • Instagram photos and videos "Welcome to my Instagram. These images will be posted without explanation, for your interpretation. Enjoy." Honestly, I think it is a reference to a heel turn if you ask me.