#5 Rony Jason

The Featherweight winner of the inaugural Ultimate Fighter: Brazil season, Rony Jason seemed like he had all of the tools to reach the top in the UFC. Named after the infamous serial killer from the Friday the 13th movie series, Jason came into the reality show with a record of 10-3, and buzzsawed his way through the competition, showing ruthless finishing skills on the feet and on the ground.
A somewhat dull win over Godofredo Pepey in the season’s finale at UFC 147 soured some fans on him, but an ultra-exciting win over Sam Sicilia in a brawl at UFC 153 sent his hype train into overdrive. Had the UFC found their next Brazilian superstar? A third Octagon win – over Mike Wilkinson – suggested they had.
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Unfortunately, that wasn’t the case. Jason suffered a violent knockout at the hands of Jeremy Stephens in his next fight, and although he then bounced back with a KO of Steven Siler, subsequent fights against Robbie Peralta, Dennis Bermudez and Jeremy Kennedy saw him flatter to deceive – and a positive drug test for a banned diuretic in 2015 didn’t help.
The case appeared to be that while Jason’s offensive skills were tremendous – meaning he could take out lower-level fighters in stunning fashion – he just didn’t have the defensive skills nor the wrestling base to succeed at the very top level. He was released from the UFC in 2017 and hasn’t returned since.