#1 He could avenge Kofi’s loss to Lesnar

Kofi Kingston had a great run as the WWE Champion after he defeated Daniel Bryan at WrestleMania 35 for the Championship. He went undefeated for a long time and defended his title well in every single Title match.
On October 4, at the season premiere of SmackDown on Fox, Kofi came face to face with none other than ‘The Beast’ Brock Lesnar who defeated him in 10 seconds after delivering a single F5.
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The move ended Kofi’s great run as Champion in a very unceremonious manner and hurt his image and Championship reign a little. Big E, who is very close to Kofi, can be the perfect man who could face Brock Lesnar to avenge his friend's loss.
Big E is well built and can match the strength and brutality of Lesnar well. A win at the Royal Rumble could help him build a storyline where he chases current WWE Champion Brock Lesnar for the title just to avenge Kofi’s loss in October.
This would prove to be a great storyline that fans could get behind as they love Big E and the New Day, and do not really like Lesnar.
Whether Big E wins or loses will not hurt his reputation, but the story could really help him get ahead and have a great singles run later on.