#4 Seth Rollins' knee injury in 2015
In 2015, Seth Rollins was in the middle of a monster push as WWE Champion. He had defeated numerous opponents as the Authority’s top heel, and was enjoying immense success as a result.
However, Seth suffered a debilitating knee injury that completely changed RAW’s world title scene. Seth was forced to vacate the WWE Championship shortly thereafter, and was also forced to miss WrestleMania 32 due to this same injury.
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This caused WWE to completely change their plans for the title, which led to the feud between Roman Reigns and The Authority & the League of Nations.
This feud did little to elevate Reigns and did a lot of damage to the members of the League of Nations, and also deprived the WWE fans of the potential of seeing a main-event feud between then-heel champion Seth Rollins and an up-and-coming babyface in Roman Reigns.