#3 Debut the Undisputed Era
One of the biggest potential debuts the WWE has in the chamber of its debut gun is that of the Undisputed Era. They debuted back when Drew McIntyre was the NXT Champion, so it's not like they've only been in NXT for a few months. A combination of anyone and Kyle O'Reilly have been multi-time tag team champs and Cole has held the North American Championship as well as being the current NXT Champ.
While they are likely some of the glue that is holding the yellow brand together, the brand is still in transition from the likes of Tomasso Ciampa getting hurt and the multitude of call ups in early 2019. The likes of Keith Lee, Matt Riddle, Kushida and Mia Yim will likely be moved up the card in the coming months. And let's not forget the amount of talent in the Breakout Tournament.
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Whenever they decide to do it, WWE has to treat TUE's debut as a big deal. They are four of the most complete stars in the veins of the Four Horsemen. Each man has his strengths and role in the group, but the obvious star of the group is Adam Cole.
Their main-roster debut should be saved for a special occasion, like the Fox debut and they should target someone high up the food chain. While that is likely to be Kofi Kingston and the New Day or Roman Reigns, that would be a good way to both debut one of the best factions of recent memory while also making SmackDown's debut an immediate hit.