#3 AJ Styles

Although AJ Styles belongs to the RAW brand, it seems like WWE will continue to have cross-brand rivalries until Crown Jewel, at least. This will allow them to load Team Hogan and Team Flair up with Superstars from both brands, and also have the massive Tag Team Turmoil Match.
Keeping that in mind, another major Superstar who doesn’t have a match for the big event is AJ Styles. Even though The O.C. is scheduled to participate in the World Cup, we can safely assume that Luke Gallows and Karl Anderson can handle that for the faction, while freeing up their leader to compete in another match.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
AJ Styles is the current United States Champion and could have a title or non-title match at the event. In either case, he could take on Roman Reigns in a huge match that will increase the fans’ interest in the pay-per-view.
It would make a lot of sense for WWE to simply book a match between the two men without any story, as they have done so many times in the past for international events. As star power increasingly matters when WWE stages events overseas, a match between Reigns and Styles would definitely increase ticket sales.