#2 To make time for other matches
One of WWE's biggest problems with Pay-Per-Views is that they tend to cross the deadline. In an event such as Money in the Bank, where WWE has to finish two separate ladder matches, every second saved add up. Apparently, WWE cut the United States Championship match between Samoa Joe and Rey Mysterio short.
WWE had eleven matches on the main card - including two ladder matches that would require at least ten minutes each. While the women's ladder match went on for a little over thirteen minutes, the men's ladder match got nineteen minutes.
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If WWE did not cut corners with other matches in the night, we would not have witnessed the amazing sunset flip by Andrade and Finn Balor tonight since those riskier spots might have been removed to accommodate time.
So, this factor may have played a huge role in forcing WWE to have Reigns squash Elias.