#2. A victory for Seth Rollins at Royal Rumble would save WWE from unifying the two top championships
Before the Roman Reigns-Seth Rollins match was made official, WWE Champion Brock Lesnar offered Reigns the chance to compete in a massive match. Lesnar offered Reigns the chance to compete in a title vs title match.
The stipulation would mean that the winner would take home both championships and likely unify the titles. The company could plan to make the match the main event for WrestleMania.
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The move could damage the company's top card. If Reigns retains his title at the Royal Rumble, then the creative team will likely book a match between the two top champions at WrestleMania.
However, a win for Rollins at the Royal Rumble would help WWE avoid the booking. Rollins could free Reigns to do something different at WrestleMania. The Tribal Chief could go on to challenge Lesnar for his title after losing the Universal Championship.
It would allow the creative team to book a headlining match between The Beast Incarnate and Reigns without worrying about unifying the two top titles.