#2 Big E

We still don't know which member of The New Day will be filling the final spot of the men's Money in the Bank match on Sunday, but based on recent reports, it seems safe to assume that it will be Big E.
He makes the most sense too. Kofi Kingston and Xavier Woods are terrific performers, but neither of them really strike you as credible main event candidates. Apart from the fact that they're both kind of small, they've been in the mid-card for too long to suddenly mount a push towards the top of the show.
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By contrast, Big E is a former NXT Champion. He's got experience of fighting the last match on the show, and as a mega baby-face, he could be a great opponent for Shinsuke Nakamura should the latter win the WWE Title in Rosemont.