#1. Seth Rollins shocks the world
While Reigns has had the most notable main roster successes of any NXT alumnus, Seth Rollins is the one who has made professional wrestling history time and time again.
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The first champion of WWE's new developmental brand, Rollins became the first NXT Champion to win the main roster world title, and the first to stand tall in the main event of a WrestleMania (granted, he wasn't actually booked in that match, but it's a victory nonetheless).
Rollins cashed in his Money in the Bank briefcase to close out WrestleMania 31, a feat which had never been accomplished at the Showcase of the Immortals; some sources say Rollins, Reigns, and Lesnar were notified of this change during the lengthy Triple H/Stephanie McMahon/Ronda Rousey promo (which had a dual purpose of stalling for sundown to improve the darkness-enhanced entrances to come and also to allow producers to meet with talent about changes to the close of the show).

Roman Reigns's biggest WrestleMania successes might not make the annual WrestleMania Moments packages as each successive show arrives (and, in the case of WrestleMania 33, the story always focuses on his opponent when that match is discussed); however, it's impossible to imagine a WrestleMania promo without the first NXT alumnus to claim golden glory on wrestling's grandest stage.