#3 Rusev
The Bulgarian Brute was once possibly the most over Superstar on the blue brand. His "Rusev Day" gimmick had taken off and he was being heavily cheered on a weekly basis. Fans expected WWE to push Rusev and give him an opportunity to prove himself on the main event scene. He lost a Fatal Four Way match at WrestleMania 34, and his star soon fizzled out.
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Ever since then, Rusev has taken multiple shots at WWE on social media. Recently, he stated that Rusev Day is dead. Later, he was seen debating with Charlotte Flair on what he needs to do to get over like her.
He recently posted a photo on his official Instagram handle. The picture features him in his home country of Bulgaria. The caption to the photo stated that he is enjoying his "retirement" in Bulgaria. This was a subtle shot at WWE for not booking him on the main roster for a good while.