#2 Feud with each other
Following the return program with Lashley and Rush, both Kevin Owens and Sami Zayn would likely have similar paths to WrestleMania. Their careers have been intertwined forever, and it only makes sense to further their storyline.
Earlier this year, they both teased some tension heading into 'Mania, but ended up sticking together to face Shane McMahon and Daniel Bryan. The rebels could go at it next year.
Both Owens and Zayn are no strangers to the shocking heel turn, either of them could pull it off.
They could play any role in WWE, and that makes them valuable members of the roster. The company could book a match between Owens and Zayn, and you wouldn't know who the face or heel is.
A reverse dynamic with Zayn playing the dastardly bad guy against the valiant Owens certainly springs a lot of intrigue to mind. Whatever the case is, a WrestleMania match between Kevin Owens and Sami Zayn would be a classic.
It has been a long time coming.