#1. The Undisputed Era
While Bobby Fish and Kyle O'Reilly were a great tag team as both reDRagon and the initial tag team of the Undisputed Era, something about Roderick Strong just seems to put the team on another level.
Fish's injury was actually a benefit for the team because Strong is younger, quicker and more explosive (in my opinion). Strong was already doing well as a singles' star in both ROH and NXT but his turn on Pete Dunne in order to join the Undisputed Era just upped his stock.
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They did recently drop the belts to the War Raiders, but you have to think they are destined for bigger things in the second half of 2019. Adam Cole stated that they'd all be holding gold in 2019, but he didn't mean specifically in NXT. Could the faction debut after WrestleMania in the annual Superstar Shake Up?
Adding them would change the landscape of WWE if booked properly and not fed to someone like John Cena. If you need any proof of their greatness, pick from any of the matches they've had with Oney Lorcan and Danny Burch, the War Raiders, AOP, WarGames and Mustache Mountain.
Just think of the matches they'd be able to have with the likes of the Revival, the Usos, the New Day and others.