#2 The Roman factor

Roman Reigns main-evented WrestleMania 31, 32, 33, and 34. There were rumours of a Shield Triple Threat at WrestleMania 35 for the Universal Championship before Roman Reings left WWE in October, vacating the Universal Championship.
Imagine trying to create a character to replace your Hollywood bound superstar for over five years, and then he has to unfortunately leave the company. WWE was stuck in a limbo once Reigns left, as there was no central figure left on RAW.
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WWE has always had a focal point. Cena, Rock, Austin, Hogan, etc, were presented as the top guys of the company. However, in Roman's absence there is apparently no one who can claim that spot.
WWE could turn back to Cena, the former 'top guy'. Cena can still deliver and carry the company on his back for a few months, till the promotion finds an alternative.
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