2019: Roman Reigns' Return
In general, WWE did not do a great job in booking Roman Reigns following his return from battling leukemia in February. Sure, the Shield reunion and program with Drew McIntyre did well, but after WrestleMania, at a time when 'The Big Dog' was over as ever, he was saddled in a feud with Shane McMahon. He even took a pinfall loss against the non-wrestler. That's a good way to ruin your top face's momentum. How did WWE let this happen?
After that feud was over, Reigns started getting attacked by a mystery assailant. He had some scaffolding fall over him, as well as a car ram into his own vehicle. This story had a lot of potential, with twists and turns expected. It was the story of the summer. Daniel Bryan, Buddy Murphy, and Erick Rowan were all very involved in proceedings, but it ended up being one of the most disappointing storylines of the entire year.
After the reveal of a Rowan lookalike on one episode of SmackDown, the attacker was revealed to be... Erick Rowan himself. This came to Bryan's surprise, destroying the week-on-week continuity of the story. Rowan received a month-long push as a monster, picking up a singles victory over Reigns at Clash of Champions. It eventually led to a face turn for Bryan, while Rowan is now having weekly squash matches on RAW.
This could have been a bigger deal, as Roman Reigns' entire comeback obviously should have been.
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