#1 Sami Zayn

Sami Zayn is one of the most talented performers in WWE today, and along with Kevin Owens, he has already seemingly entered into a high-profile rivalry with Kurt Angle just a week after his move to Raw.
Zayn got pulled off from the event earlier this week out of respect to the local culture in Saudi Arabia. Being of Syrian descent, and due to their strained diplomatic ties with Saudi Arabia, WWE didn't want to have tense relations with the host country.
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Zayn's inclusion could have played a vital role in the historic Royal Rumble match considering his feuds with Angle, Shane McMahon, and Daniel Bryan. Whether the decision was right or wrong is a controversial opinion, but from the fans' point of view, WWE missed a golden opportunity in rekindling old rivalries and fuelling new ones.