#2 Defeat to John Cena
John Cena is already a legend in WWE. He has been on top of the WWE for a very long time and has been one of the most dominant stars on the roster. However, in recent years, John Cena has shifted his focus from WWE to Hollywood and has taken a part-time role in WWE.
At this stage in his career, John Cena has fought against Superstars like Rollins, Styles, Nakamura and has lost against them which has helped establish them as Superstars. WWE had the same opportunity to make Balor look strong by letting him defeat Cena just like other stars did but WWE didn't let it happen and made Balor look like a chump as he was defeated in a convincing manner.
WWE still has the chance to re-write the wrong they did and book Cena vs Balor for Mania and let Balor come out on top.