#2 No Other Credible Contender

It's no secret that Raw is lacking some credible competition for the Universal Championship and the company decided to make the phenomenal switch by bringing the former WWE Champion over to Monday Nights. This elevated the division and the show, thereby making it a possibility that Seth Rollins will have some competition at Money In The Bank.
While Braun Strowman is on the roster, but he has been subjected to some irrelevant stories in the past including a storyline with SNL hosts as WrestleMania drew close. The story hasn't ended, as The Monster Among Men is still a part of some storylines that don't have any credibility.
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This is one of the reasons why AJ Styles was chosen over the roster to be the #1 contender for the Universal Championship. While this isn't the only reason, because the final point in the slide holds more relevance.