#2. Jack Swagger
Jack Swagger was pushed to the top very quickly after his debut. He accomplished so much in a small amount of time after he joined the company. He debuted in ECW on September 2008 where he began an undefeated streak that lasted until February 2009. In January of that year, he won the ECW Championship, less than four months after debuting.
He went on to lose the title and then won the Money In The Bank ladder match. Subsequently, on an episode of SmackDown, he successfully cashed in the contract against Chris Jericho to become World Heavyweight Champion. When we look at where Swagger's career was heading towards his departure and we look back at his run as World Heavyweight Champion, it still comes to a surprise that he held the title.
Swagger eventually lost his only World Heavyweight Championship to Rey Mysterio at Money in the Bank in 2010 and his career finally went downhill faster than he could say, jobber. Swagger went on an extended losing streak in 2012 before taking time off. After his return in 2013, in the lead-up to WrestleMania XXX--he went on yet another losing streak, while Cero picked up multiple victories over him.