#2: Daniel Bryan

As things stand, Daniel Bryan has no clear challenger for his WWE Championship at WrestleMania. While many fans are hoping that Kofi Kingston will now be the man to challenge Bryan, it seems more likely that the WWE will relegate him back down the card after his match at Fastlane.
Bryan has spent years of his career working as the ultimate underdog, and having Zayn come in under the same role and taking his title from him could be seen as a passing of the torch moment.
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Of course, Sami Zayn is currently a Raw wrestler but the WWE has shown they are willing to play fast and loose with these rules in recent weeks.
Zayn could also be perfectly cast as the everyday guy against Bryan's current self-righteous heel gimmick.