#2 His United States Championship reign is the longest in WWE history
Another aspect of Jon Moxley's illustrious career under Vince's supervision was his initial run as a vindictive mercenary in The Shield. Despite the fact that the spotlight was bound to be on someone else, The Lunatic Fringe ascended his credibility as a top-tier Superstar and held the United States Championship for a record 351 days.
The former United States Champion went on to dominate the mid-card scene on the main roster whilst Roman Reigns and Seth Rollins were propelling the tag team division to unprecedented heights.
One cannot deny that The Shield was unstoppable in their initial run, but even if you analyze the way Ambrose made his mark on the main roster, his United States Championship reign is too difficult to be overtaken.
Judging by the way the company has presented the United States title, one can't help but admit that The Lunatic Fringe will remain the longest reigning United States Champion of the 21st century for a long, long time, if not forever.