Might be AEW Champion Soon #2: MJF
While it's great that AEW can provide platforms for established talent like Jon Moxley, Chris Jericho, and Jack Hager, it is also a place where fans who don't closely follow the indie scene can see some future legends in the business.
Maxwell Jacob Friedman, perhaps better known by the initials MJF, is such a future legend. MJF cut his teeth in the insane Combat Zone Wrestling promotion. At that point in his career, MJF was a babyface who wrestled under the name Pete Lightning, and as his name might suggest he was primarily a high flyer.
MJF has evolved into a more complete wrestler, though he can still come off the top rope if it suits him. Despite his involvement with popular indie leagues MLW and CZW, a lot of fans who only follow more mainstream promotions had never heard of him until his involvement with AEW. Since he was intrinsically involved in the finish of the Jericho/Cody match, you can bet that he's not done with the AEW World title picture.