#2 Better marketability at a new weight-class
They say a true champion, is one who knows how to get back up after being knocked down. In connection with the same, Conor McGregor has time and again solidified the fact that he is indeed a true warrior who has the heart of a champion.
But with that being said, the sport of Mixed Martial Arts is still a business, and losses do have an adverse effect on a given fighter's marketability, at least to a certain extent even in best case scenarios. McGregor's UFC 229 submission loss may have impacted the man's global brand value as a fighter, and he does need to get back in the win column so as to rectify the same.
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Nevertheless, should McGregor choose to return to Welterweight, akin to his pair of fights with Nate Diaz, his marketability would be intact. Especially considering that he hasn't fought in the weight-class too many times, and the only two times he did compete at Welterweight, both fights turned out to be classics...