#5 Batista
Batista is one of the four big names of the Ohio Valley class of 2002, the others being John Cena, Randy Orton and Brock Lesnar. While the other three are still with the company, "The Animal" was last seen on June 2, 2014, edition of Raw. Batista has done fairly well outside WWE.
The Guardians of Galaxy franchise has been a massive hit and that is probably what made WWE reach out for Batista. His previous return was turned into a disaster, thanks to the massive popularity of Daniel Bryan. However, according to the recent reports, Batista still wants to return back to the company as a full-time wrestler. Even in his last tenure, The Animal did not hesitate in putting other guys over. His passion for professional wrestling even at this age is truly amazing.