#3 A Tag Match with Sami Zayn against Shane McMahon and a Mystery Partner

Until this week's edition of Smackdown, this would have been the most expected close to this storyline. Shane McMahon has abused his power for months and Kevin and Sami have felt the rough end of it and the most logical end to that storyline would be some sort of tag match between them all.
From a storyline perspective, Daniel Bryan could work as Shane's partner, with the two finally forming a united front. That seems unlikely at this juncture, though, so the next best bet would be Randy Orton.
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With Shinsuke winning the Royal Rumble, Randy has very little to do on Tuesday nights at the moment and it's difficult to imagine him being left off the Wrestlemania card altogether.
An outside bet would be Chris Jericho, given his history with Kevin Owens but he has concerts lined up with Fozzy that weekend, so we can probably rule that out.