#1 The New Day turns on Kofi Kingston

Kofi Kingston is in the middle of a personal rivalry with Randy Orton, with the pair bringing up the fact that Randy basically ended Kofi's big push 10 years ago. Kofi would never have a push that big again until the start of this year.
The only way to make this feud more personal is to have Kofi's partners Big E and Xavier Woods get involved in the match and turn on Kofi leading to Randy Orton becoming WWE Champion once again at Summerslam.
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It could be either man but Big E makes more sense. He used to have a bodyguard gimmick where he looked after Dolph Ziggler and AJ Lee so he could return to this role to help Randy. Since they have been together for over five years now any of them turning would be maybe the most shocking moment of the year so far.