#2 Cody Rhodes
Cody Rhodes had the attention of many in WWE when he debuted in 2007. He had previously been looked at by many as the rookie of the year in 2006, and had big things to come.
Cody mainly stuck to the tag team ranks during his first couple years in WWE, having various Tag Teams Championship reigns with Hardcore Holly, Ted DiBiase Jr. and Drew McIntyre. And while The Legacy faction of he and DiBiase with Randy Orton was pretty hot for a while, all the focus remained on Orton, and when it did come to he and Ted, it seemed like WWE was more interested in pushing DiBiase.
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Cody did later find some success, as a 2 time WWE Intercontinental Champion and a well received tag team with brother Goldust, where they also became 2 time Tag Team Champions, but as a solo star, he was still being wasted, especially when performing as Stardust.
Cody left WWE in 2016 and has since become arguably the biggest name in wrestling outside of WWE, becoming the ROH World Champion, NWA World Champion and a Vice President of the new All Elite Wrestling promotion.
As Cody and the late Dusty Rhodes had said, WWE had several times to go all the way with Cody, but just didn't. Cody would have made a great WWE Champion.