#4. This is the first WrestleMania Dean Ambrose has missed since his debut

Dean Ambrose was injured on Monday Night Raw back in December and it was later announced that the former World Champion would be out of action for up to nine months after it was revealed that he required surgery on his injured tricep.
Ambrose made his debut back in November 2012 and has appeared at the last five WrestleMania events in tag team matches, in the Intercontinental Championship ladder match, in a match against Brock Lesnar and last year he walked in as IC Champion and defended his title against Baron Corbin.
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With rumors that Ambrose's injury is much worse than first thought, it seems that this year will be the first year that The Lunatic Fringe has missed the Showcase of the Immortals, which means that Roman Reigns is the only Shield member who has been present at every show since their collective debut.