#1 The Undertaker could turn on Roman Reigns

The Undertaker fought Goldberg at Super ShowDown but the former made a shocking return on RAW last week. When Shane McMahon and Drew McIntyre were assaulting Roman Reigns, Undertaker's music hit and the Phenom Chokslammed Shane. Moreover, McIntyre also ate a Big Boot from the Deadman.
The Undertaker is scheduled to fight at Extreme Rules where the Deadman will team up with the Big Dog. The team of Reigns and Undertaker will face the team of McIntyre and Shane.
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Unless WWE plans to shock everyone, Undertaker and Reigns are likely to win at Extreme Rules, however, we can see a twist in this match. Though Undertaker returned to save Reigns, it didn't make sense. The two men fought each other at WrestleMania 33. Apart from Brock Lesnar, Reigns was the only other man to pin Undertaker at the Showcase of Immortals.
It will not be surprising if Undertaker turns on Reigns at Extreme Rules. A heel turn could lead to a match between Reigns and Undertaker at Summerslam, where the latter could take redemption of his previous loss.