#4 Alberto Del Rio
The Mexican Superstar was once a major future prospect in WWE when he won the first-ever 40-men Royal Rumble match in history. Del Rio went on to hold both the World Heavyweight Title and the WWE Title on several occasions. He was ultimately released from the company but was brought back in 2015. By the end of 2016, he exercised his opt-out clause, claiming that WWE didn't deliver on the main event promises that were made to him.
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After his departure, Del Rio was seen demonizing Triple H and WWE in a series of videos that also featured WWE Diva Paige, who was involved with the former WWE Champion at the time. Looking at the kind of profanities Del Rio hurled at Triple H in his infamous video series is enough for a fan to wonder whether The Game will ever give him another chance to come back to the company.