when many believed that there couldn't be any stars at 155 pounds. Several months after declaring his retirement from mixed martial arts, B.J. Penn announced that he would be returning to the octagon after repeated challenges made by welterweight prospect Rory MacDonald; stating, "Rory, I accept your challenge!". Initially, Penn was expected to face Rory MacDonald on September 22, 2012, at UFC 152. However, MacDonald pulled out of the bout after sustaining a cut to the forehead while training. Penn vs. MacDonald eventually took place on December 8, 2012, at UFC on Fox 5. Penn lost the fight via unanimous decision. After the fight Dana White stated that he'd like to see B.J. Penn retire from mixed martial arts, although Penn has hinted a desire to return to the UFC's lightweight division. Following months of silence regarding his future, Penn spoke with Ariel Helwani in an interview for UFC on Fox, where he admitted that he was still undecided on his future, telling him that "at this moment, my guess is probably a little better than yours, but I don't know, I'm enjoying what I'm doing." Move to featherweight and losing streak An announcement was made on UFC Tonight in September 2013 that Penn will return from his hiatus and move to the Featherweight division to coach against rival, Frankie Edgar for the 19th season of The Ultimate Fighter. This move marked Penn's second appearance serving as a head coach for The Ultimate Fighter, his first being The Ultimate Fighter 5, opposite Jens Pulver. The season aired on Fox Sports 1 and featured middleweight and light heavyweight contestants. The two coaches faced each other for the third time on July 6, 2014, at The Ultimate Fighter 19 Finale. Penn returned to Nova União under coach André Pederneiras (who promoted Penn to black belt in Brazilian Jiu-Jitsu in 1999) in preparation for his fight camp against Edgar; training alongside former UFC Bantamweight Champion Renan Barão and UFC Featherweight Champion José Aldo. Later in the camp, he also enlisted former UFC Bantamweight Champion Dominick Cruz in Hilo, Hawaii for his preparation. Penn lost the one sided bout by TKO in the third round. At the conclusion of the bout, Penn announced his intentions to retire again during the event's post-fight press conference. In January 2016, after an 18-month hiatus, the 37 year old Penn announced his intentions to return to active competition