#4. WWE's Bo Dallas and Sarah Backman
Bo Dallas hasn't been on WWE programming for close to a year. The former NXT Champion seemed destined for great things when WWE promoted him to the main roster back in 2014.
The company pushed Bo Dallas's inspirational character on the main roster for many months, before Dallas went on to be part of The Social Outcasts, The Miztourage, and finally The B Team.
It's easy to argue that his time with NXT was the most successful run of his career. He was the first of the Rotunda brothers to win a championship. Dallas's time on NXT was equally important because this is when the star met his future wife Sarah Backman.
As a former eight-time Arm Wrestling Champion, Backman had some skills that WWE was interested in. They signed the German star to a contract back in 2013.
Sadly, Backman's career didn't pan out. WWE granted her her release back in 2014, just months after she took on the ring name Shara.