Might fail in WWE: His Bullet Club Brethren are mostly midcarders

While AJ Styles is a no-questions-asked main event talent in WWE, and a multi-time world champion, some of his former Bullet Club brothers aren't doing nearly as well.
Take Finn Balor for example. Balor was wildly popular in NXT and had a great run in New Japan Pro Wrestling as Prince Devitt. However, once he made his transition to the main roster, Balor floundered. He was fortunate enough to be made the company's first Universal Champion, but then he was unfortunate enough to be injured. His momentum has never recovered.
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Then there's Andersen and Gallows, AJ Styles' best buds from Japan. While they haven't been unsuccessful, they still are not the top tag team in the WWE by a long shot.
Omega might meet a similar fate if he signs with WWE.