#1 Baron Corbin Cashes In

Roman Reigns would not lose the Universal Championship in his first defense. Braun Strowman couldn't lose clean to Reigns as this would damage his character. Ambrose, Rollins, McIntyre and Ziggler are rumored to interfere in the match. Their interference could set up a screwy finish. However, one other way to protect Strowman and Reigns at the same time would be if someone else gets pinned.
Braun Strowman handed over his Money in the Bank briefcase to Baron Corbin and told him to bring the contract with him at Hell in a Cell. Baron Corbin, who likes to abuse his power as the GM, could have a much larger role than simply handing over the briefcase for Braun Strowman to the referee before the match.
He could announce himself as the rightful owner of the briefcase and insert himself in the match, making the match a triple threat. If this ends up happening, expect Reigns to pin Corbin and continue his feud with Strowman.