#2 A No. 1 contender's match
Even though it was made clear that Reigns won't be interfering in Seth Rollins' affairs with Lesnar, there's still a slight possibility of the storyline taking a turn for the worse.
As Mania approaches near, The Shield agrees on the fact that Roman does deserve his rematch for the Universal title. Dean starts acting weird again and tells Reigns that he is his equal, and wants the shot too.
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This could lead to a number one contender's match at the grandest stage of them all, with Reigns defeating Ambrose in a hard-fought match, to cement his place in the main event, alongside Rollins and Lesnar.
WWE's obsession with Reigns and WrestleMania main events isn't exactly a secret. There's still a possibility of the company inserting Reigns in the match by any means possible, and this could be a possible way to do that.
Rollins could still win the title, but he would have to overcome Lesnar as well his brother Reigns, in a rematch from WrestleMania 31.